// API v3 public interface declaration
syntax = "proto3";

package ext.maps.booking.partner.v3;

// +------+------------------------------+----------------------------------+
// | Verb |          HTTP Path           |      Request/Response Body       |
// +------+------------------------------+----------------------------------+
// | GET  | /v3/HealthCheck              | -                                |
// |      |                              | -                                |
// +------+------------------------------+----------------------------------+
// | POST | /v3/CheckAvailability        | CheckAvailabilityRequest         |
// |      |                              | CheckAvailabilityResponse        |
// +------+------------------------------+----------------------------------+
// | POST | /v3/CreateBooking            | CreateBookingRequest             |
// |      |                              | CreateBookingResponse            |
// +------+------------------------------+----------------------------------+
// | POST | /v3/UpdateBooking            | UpdateBookingRequest             |
// |      |                              | UpdateBookingResponse            |
// +------+------------------------------+----------------------------------+
// | POST | /v3/GetBookingStatus         | GetBookingStatusRequest          |
// |      |                              | GetBookingStatusResponse         |
// +------+------------------------------+----------------------------------+
// | POST | /v3/ListBookings             | ListBookingsRequest              |
// |      |                              | ListBookingsResponse             |
// +------+------------------------------+----------------------------------+
// | POST | /v3/CheckOrderFulfillability | CheckOrderFulfillabilityRequest  |
// |      |                              | CheckOrderFulfillabilityResponse |
// +------+------------------------------+----------------------------------+
// | POST | /v3/CreateOrder              | CreateOrderRequest               |
// |      |                              | CreateOrderResponse              |
// +------+------------------------------+----------------------------------+
// | POST | /v3/ListOrders               | ListOrdersRequest                |
// |      |                              | ListOrdersResponse               |
// +------+------------------------------+----------------------------------+

// CheckAvailability method

// Request to check availability for a Slot.
message CheckAvailabilityRequest {
  // The appointment slot that is being checked (required)
  Slot slot = 1;
}

// Response for the CheckAvailability RPC with the availability of the
// appointment slot.
message CheckAvailabilityResponse {
  // The requested slot. (required)
  Slot slot = 1;
  // Number of available spots.
  // 0 indicates that the appointment slot is not available. (required)
  int32 count_available = 2;
  // This enum indicates what requirements exist for the user to acknowledge or
  // view the requested slots duration/end time.
  enum DurationRequirement {
    // The handling of the end time is not specified. This is the default.
    DURATION_REQUIREMENT_UNSPECIFIED = 0;

    // The end time is not shown to the user.
    DO_NOT_SHOW_DURATION = 1;

    // The end time has to be shown to the user before an appointment can be
    // made.
    MUST_SHOW_DURATION = 2;
  }
  // The requirement to show the slots duration and/or endtime. This field will
  // be ignored if the slot is unavailable. (optional)
  DurationRequirement duration_requirement = 3;

  // Optionally, the partner can return additional updated information about the
  // availability for this merchant if this information is present when
  // responding to the CheckAvailabilityRequest and if there is no negative
  // impact on the CheckAvailability request latency.
  // For instance an entire day of merchant availability for a superset of
  // resources can be returned here.
  AvailabilityUpdate availability_update = 4;
}

// An update to one ore more slots indicating that the availability for the
// associated time has potentially changed.
message AvailabilityUpdate {
  repeated SlotAvailability slot_availability = 1;
}

// An inventory slot and associated count of open spots.
message SlotAvailability {
  Slot slot = 1;
  // Number of available spots.
  // 0 indicates that the appointment slot is not available. (required)
  int32 count_available = 2;
}

// CheckOrderFulfillability method

// Request to check the fulfillability of an order.
message CheckOrderFulfillabilityRequest {
  // The merchant that this order is intended for. (required)
  string merchant_id = 1;

  // The line items in this order. All services requested must belong to the
  // specified merchant. (required)
  repeated LineItem item = 2;
}

// Response for the CheckOrderfulfillabilityRequest.
message CheckOrderFulfillabilityResponse {
  // Fulfillability status of the order, potentially contains updated
  // availabilities and prices of the requested line item. (required)
  OrderFulfillability fulfillability = 1;

  // Total processing fees & taxes that need to be paid for this order.
  // (required)
  Price fees_and_taxes = 2;
}

// GetBookingStatus method

// Request to get booking status and prepayment status for a Booking.
message GetBookingStatusRequest {
  // ID of the existing booking (required)
  string booking_id = 1;
}

// Response for the GetBookingStatus RPC with booking status and prepayment
// status.
message GetBookingStatusResponse {
  // ID of the booking (required)
  string booking_id = 1;

  // Status of the booking (required)
  BookingStatus booking_status = 2;

  // Prepayment status of the booking (required)
  PrepaymentStatus prepayment_status = 3;
}

// CreateBooking method

// Request to create a Booking for an inventory slot. Consumes the lease if
// provided.
message CreateBookingRequest {
  // The inventory slot that is being requested to make this booking.
  // If lease_ref is provided, slot must match the lease; slot is provided for
  // the partner to verify the lease information.
  // If lease_ref is absent, then create the booking for the slot. (required)
  Slot slot = 1;

  // The lease that is being confirmed to make this booking.
  // If lease_ref is provided, then create the booking using the lease.
  // (optional)
  LeaseReference lease_ref = 2;

  // Personal information of the user making the appointment (required)
  UserInformation user_information = 3;

  // Information about payments. When payment authorizations are handled by
  // Google, if the booking request does not succeed, payment authorizations are
  // automatically canceled. (optional)
  PaymentInformation payment_information = 4;

  // The parameters to be used if the payment is processed by the partner
  // (i.e. payment_information.payment_processed_by is equal to
  // PROCESSED_BY_PARTNER). (optional)
  PaymentProcessingParameters payment_processing_parameters = 5;

  // Idempotency token for CreateBooking requests. (required)
  string idempotency_token = 6;

  // A string from the user which contains any special requests or additional
  // information that they would like to notify the merchant about. (optional)
  string additional_request = 7;
}

// Response with the created Booking for an inventory slot.
message CreateBookingResponse {
  // The created booking (required)
  Booking booking = 1;

  // The updated user payment option used in this booking.
  // If a new payment option was purchased to pay for the booking, this should
  // be a newly created user payment option.
  // If an already purchased user payment option was used for this booking,
  // this should reflect an updated version of that user payment option.
  // (optional)
  UserPaymentOption user_payment_option = 2;

  // If creating a booking fails, this field should reflect the business logic
  // error (e.g., slot has become unavailable) and all other fields in the
  // CreateBookingResponse message are expected to be unset. (required if
  // failure occurs)
  BookingFailure booking_failure = 3;
}

// CreateLease method

// Request to create a Lease for a slot in the inventory.  The expiration time
// in the returned Lease may be modified by the backend, e.g. if the requested
// lease period is too long.
message CreateLeaseRequest {
  // The lease to be created with information about the appointment slot
  // (required)
  Lease lease = 1;
}

// Response for the CreateLease RPC with the created Lease.
message CreateLeaseResponse {
  // The created Lease (required)
  Lease lease = 1;

  // If creating a lease fails, this field should reflect the business logic
  // error (e.g., slot has become unavailable) and lease field is expected to be
  // unset. (required if failure occurs)
  BookingFailure booking_failure = 2;
}

// Temporary lease for an inventory slot
message Lease {
  // ID of the lease.
  // Not populated in CreateLeaseRequest. The value is chosen by the partner and
  // has to be returned in the response of CreateLease. (required)
  string lease_id = 1;

  // The appointment slot that the lease is created for. (required)
  Slot slot = 2;

  // Unique identifier for this lease, chosen by Reserve with Google. Serves as
  // an idempotency token for CreateLease requests. (required)
  string user_reference = 3;

  // Expiration time of the lease in UTC Timestamp (required)
  int64 lease_expiration_time_sec = 4;
}

// Reference to a Lease that has been created via CreateLease.
message LeaseReference {
  // Lease ID (required)
  string lease_id = 1;
}

// CreateOrder method

// Request to create an order.
message CreateOrderRequest {
  // The order to create. (required)
  Order order = 1;

  // The parameters to be used if the payment is processed by the partner
  // (i.e. order.payment_information.payment_processed_by is equal to
  // PROCESSED_BY_PARTNER). (required if payment is processed by the partner)
  PaymentProcessingParameters payment_processing_parameters = 2;

  // Idempotency token for CreateOrder requests. (required)
  string idempotency_token = 3;
}

// Response for the CreateOrderRequest.
message CreateOrderResponse {
  // All line items in an order either fail or succeed together.
  // This means that if some of the items cannot be fulfilled, the entire
  // order must fail, the booking must not be made for any item, and the user
  // must not be charged.
  oneof result {
    // The order created.
    Order order = 1;

    // If creating an order fails, this field should reflect the business logic
    // error (e.g., slot has become unavailable or price has changed).
    OrderFailure order_failure = 2;
  }
}

// ListBookings method

// Request to list all bookings for a user
message ListBookingsRequest {
  // ID of the user (required)
  string user_id = 1;
}

// Response for the ListBookings RPC with all bookings for the requested user.
message ListBookingsResponse {
  // All bookings of the user (required)
  repeated Booking bookings = 1;
}

// ListOrders method

// Request to list orders.
message ListOrdersRequest {
  message OrderIds {
    repeated string order_id = 1;
  }

  // Request of orders either by user ID, or by order ID.
  oneof ids {
    // If set, return all orders belong to the user.
    string user_id = 1;

    // If set, return the specified orders.
    OrderIds order_ids = 2;
  }
}

// Response for the ListOrders RPC.
message ListOrdersResponse {
  // All requested orders (required)
  repeated Order order = 1;
}

// UpdateBooking method

// Request to update a Booking.
message UpdateBookingRequest {
  // The booking to be updated
  // The following fields can be set in a booking:
  // - status, to cancel a booking.
  // - start_time and duration in the slot, to reschedule a booking. (required)
  Booking booking = 1;
}

// Response with the updated Booking.
message UpdateBookingResponse {
  // The updated booking (required)
  Booking booking = 1;

  // The updated user payment option originally used to pay for this booking.
  // This should be set if the UpdateBookingRequest results in a change to
  // the UserPaymentOption.
  // For instance, if the booking is canceled, the UserPaymentOption should
  // reflect an additional credit to the user. In the case of a multi-use
  // payment option, the current_count should be increased by one to
  // allow the user to create another booking with this payment option. In the
  // case of a single-use payment option, a new single-use user payment option
  // should be returned. (required if altered in update)
  UserPaymentOption user_payment_option = 2;

  // If updating a booking fails, this field should reflect the business logic
  // error (e.g., booking is not cancellable) (required if failure occurs)
  BookingFailure booking_failure = 3;
}

// Booking specification

// A booking for an inventory slot
message Booking {
  // ID of this booking (required)
  string booking_id = 1;

  // The appointment slot of this booking (required)
  Slot slot = 2;

  // Personal information of the user making the appointment (required)
  UserInformation user_information = 3;

  // Status of the booking (required)
  BookingStatus status = 4;

  // Information about payment transactions that relate to the booking.
  // (optional)
  PaymentInformation payment_information = 5;
}

// BookingStatus specification

// Status of a booking.
//
// Updating booking status does not change the status of the associated payment.
// Prepayment status updates should be done using the PrepaymentStatus enum.
//
// nextID: 6
enum BookingStatus {
  // Not specified.
  BOOKING_STATUS_UNSPECIFIED = 0;
  // Booking has been confirmed
  CONFIRMED = 1;
  // Booking is awaiting confirmation by the merchant before it can transition
  // into CONFIRMED status
  PENDING_MERCHANT_CONFIRMATION = 2;
  // Booking has been canceled on behalf of the user.
  // The merchant can still trigger a manual refund.
  CANCELED = 3;
  // User did not show for the appointment
  NO_SHOW = 4;
  // User did not show for the appointment in violation of the cancellation
  // policy.
  NO_SHOW_PENALIZED = 5;
}

// BookingFailure specification

// Status data that conveys why (1) creating a lease or (2) creating or updating
// a booking fails.
// BookingFailure is intended to primarily capture business logic errors.
message BookingFailure {
  enum Cause {
    // Default value: Don't use; amounts to an "unknown error"
    CAUSE_UNSPECIFIED = 0;
    // The referenced availability slot is not available any longer.
    SLOT_UNAVAILABLE = 1;
    // The user has already booked an appointment for the referenced
    // availability slot.
    SLOT_ALREADY_BOOKED_BY_USER = 2;
    // The lease (if provided) has expired and cannot be used any longer to
    // complete the requested booking.
    LEASE_EXPIRED = 3;
    // The requested cancellation cannot be performed at the current time due
    // to time restrictions in the merchant's cancellation policy.
    OUTSIDE_CANCELLATION_WINDOW = 4;
    // An error was encountered while processing the payment because the
    // provided credit card type was not accepted by the merchant. The credit
    // card type must be supplied in rejected_card_type.
    PAYMENT_ERROR_CARD_TYPE_REJECTED = 5;
    // An error was encountered while processing the payment because the
    // provided credit card was declined.
    PAYMENT_ERROR_CARD_DECLINED = 6;
    // An error was encountered with the pack/membership used to pay for the
    // booking. There could be no valid uses left, it could have expired, etc.
    PAYMENT_OPTION_NOT_VALID = 7;
    // An error was encountered while processing the payment for this booking.
    // Use this value to indicate a general payment related error, only if the
    // error does not match to a specific payment error above.
    PAYMENT_ERROR = 8;
    // User cannot use the given payment option (e.g. user trying to use a
    // first time price for the second time).
    USER_CANNOT_USE_PAYMENT_OPTION = 9;
    // A booking that the user tried to cancel has already been cancelled.
    BOOKING_ALREADY_CANCELLED = 10;
    // A booking that the user tried to cancel is not cancellable.
    BOOKING_NOT_CANCELLABLE = 11;
    // User has an existing reservation too close to this time.
    OVERLAPPING_RESERVATION = 12;
  }
  // The reason why the booking failed. (required)
  Cause cause = 1;

  // (required only if cause is PAYMENT_ERROR_CARD_TYPE_REJECTED)
  CreditCardType rejected_card_type = 2;

  // This optional field is used for the partner to include additional
  // information for debugging purpose only. (optional)
  string description = 3;
}

// Used when booking/order failure cause is PAYMENT_ERROR_CARD_TYPE_REJECTED to
// indicate the type of credit card that was rejected.
enum CreditCardType {
  // Default value. Used if credit card type does not match to one below.
  CREDIT_CARD_TYPE_UNSPECIFIED = 0;
  VISA = 1;
  MASTERCARD = 2;
  AMERICAN_EXPRESS = 3;
  DISCOVER = 4;
}

// Order specification

// An order for service appointments with a merchant.
message Order {
  // ID of this Order, chosen by the booking partner who handles the order
  // (required in CreateOrderResponse and ListOrdersResponse, must not be set in
  // CreateOrderRequest)
  string order_id = 1;
  // Personal information of the user making the order (required)
  UserInformation user_information = 2;
  // Information about payment transactions that relate to the Order.
  // (optional)
  PaymentInformation payment_information = 3;
  // The merchant that all services in this Order belong to.
  string merchant_id = 4;
  // Line items in this order.
  repeated LineItem item = 5;
}

// A single item in an Order--the booking of a single service in a single time
// slot.
message LineItem {
  // ID of the merchant Service. (required)
  string service_id = 1;
  // Start time of the appointment slot in seconds of UTC time since Unix epoch.
  // (required)
  int64 start_sec = 2;
  // Duration of the appointment slot in seconds. (required)
  int64 duration_sec = 3;

  message OrderedTickets {
    string ticket_id = 1;
    int32 count = 2;
  }
  // Number of tickets ordered by Ticket Type.
  repeated OrderedTickets tickets = 4;

  // In handling CreateOrderRequest and CheckOrderFulfillabilityRequest,
  // the total price (excluding taxes) of the item must be verified to guard
  // against price changes. In CreateOrderResponse and
  // CheckOrderFulfillabilityResponse, the price should be updated to the
  // correct value if the value from the request was incorrect or outdated.
  // (reqired)
  Price price = 5;

  // Status of the Line Item. (required in CreateOrderResponse and
  // ListOrdersResponse; should not be set in requests)
  BookingStatus status = 6;
}

// Status data that conveys why creating an order fails.
// OrderFailure is intended to primarily capture business logic errors.
message OrderFailure {
  enum Cause {
    // Default value: Don't use; amounts to an "unknown error"
    CAUSE_UNSPECIFIED = 0;
    // The order is no longer fulfillable.
    ORDER_UNFULFILLABLE = 1;
    // An error was encountered while processing the payment because the
    // provided credit card type was not accepted by the merchant. The credit
    // card type must be supplied in rejected_card_type.
    PAYMENT_ERROR_CARD_TYPE_REJECTED = 2;
    // An error was encountered while processing the payment because the
    // provided credit card was declined.
    PAYMENT_ERROR_CARD_DECLINED = 3;
    // An error was encountered while processing the payment for this order.
    // Use this value to indicate a general payment related error, only if the
    // error does not match to a specific payment error above.
    PAYMENT_ERROR = 4;
  }
  // The reason why the order failed. (required)
  Cause cause = 1;

  // (required only if cause is ORDER_UNFULFILLABLE)
  OrderFulfillability fulfillability = 2;

  // (required only if cause is PAYMENT_ERROR_CARD_TYPE_REJECTED)
  CreditCardType rejected_card_type = 3;

  // This optional field is used for the partner to include additional
  // information for debugging purpose only. (optional)
  string description = 4;
}

// OrderFulfillability specification

message OrderFulfillability {
  // The result of an order fulfillability check.
  enum OrderFulfillabilityResult {
    // Default value: Don't use.
    ORDER_FULFILLABILITY_RESULT_UNSPECIFIED = 0;
    // The order can be fulfilled.
    CAN_FULFILL = 1;
    // The order cannot be fulfilled due to one or more unfulfillable line
    // item(s).
    UNFULFILLABLE_LINE_ITEM = 2;
    // The combination of the line items requested cannot be fulfilled.
    UNFULFILLABLE_SERVICE_COMBINATION = 3;
    // The order cannot be fulfilled due to reasons that do not fall into the
    // categories above.
    ORDER_UNFULFILLABLE_OTHER_REASON = 4;
  }

  OrderFulfillabilityResult result = 1;
  // Fulfillability results of all line items in this order (required).
  repeated LineItemFulfillability item_fulfillability = 2;
  // Additional description of the reason if the item is unfulfillable.
  // (optional)
  string unfulfillable_reason = 3;
}

// Fulfillability of a line item.
message LineItemFulfillability {
  // The line item of question. (required)
  LineItem item = 1;

  // The result of a line item fulfillability check.
  enum ItemFulfillabilityResult {
    // Default value: Don't use.
    ITEM_FULFILLABILITY_RESULT_UNSPECIFIED = 0;
    // This line item can be fulfilled.
    CAN_FULFILL = 1;
    // No adequate availability for the slot requested.
    SLOT_UNAVAILABLE = 2;
    // Child tickets cannot be booked without an adult ticket.
    CHILD_TICKETS_WITHOUT_ADULT = 6;
    // The combination of ticket types requested cannot be fulfilled.
    UNFULFILLABLE_TICKET_COMBINATION = 3;
    // The total price of this line item is not correct.
    INCORRECT_PRICE = 4;
    // The line item cannot be fulfilled for reasons that do not fall into
    // the categories above.
    ITEM_UNFULFILLABLE_OTHER_REASON = 5;
  }
  // (required)
  ItemFulfillabilityResult result = 2;
  // Additional description of the reason if the item is unfulfillable.
  // (optional)
  string unfulfillable_reason = 3;
  // Updated availability for this slot can be piggybacked in
  // CheckOrderFulfillabilityResponse.
  message UpdatedAvailability {
    // Number of available spots for the given slot. 0 indicates no
    // availability. (required)
    int32 spots_open = 1;
  }
  // (optional)
  UpdatedAvailability availability = 4;
  // Updated ticket types can be piggybacked in
  // CheckOrderFulfillabilityResponse. If non-empty, all available ticket types
  // for this slot with up-to-date prices should be listed without omitting any.
  // (optional)
  repeated TicketType ticket_type = 5;
}

// TicketType is used to differentiate among tickets (where a ticket can be a
// spot on a raft trip, an admission to a museum, etc.) with different prices
// and/or availabilities due to different user types or different service
// attributes.
message TicketType {
  // The ticket id is used to differentiate among different ticket types of the
  // same service, and is only expected to be unique within a service.
  string ticket_type_id = 1;

  // This can be user visible, e.g., “adult”, "child", “veteran”, “Row J”, etc.
  string short_description = 2;

  // The price of a single ticket of this type, exclusive of any taxes. The tax
  // rate of Service is applied to its tickets.
  Price price = 3;
}

// Other specifications

// Resource specification that disambiguates an appointment slot
message ResourceIds {
  // The staff ID as provided in the feed or empty if not applicable or no staff
  // was selected. (optional)
  string staff_id = 1;
  // The room ID as provided in the feed or empty if not applicable or no room
  // was selected. (optional)
  string room_id = 2;
  // For Dining Reservations only: the number of seats requested in the booking.
  // (optional)
  int32 party_size = 3;
}

// Payment specification

message PaymentProcessingParameters {
  enum PaymentProcessor {
    PAYMENT_PROCESSOR_UNSPECIFIED = 0;
    PROCESSOR_STRIPE = 1;
    PROCESSOR_BRAINTREE = 2;
  }
  // The payment processor used to process payment for a given booking.
  // (required)
  //
  // Replaced by the payment_processor field.
  PaymentProcessor processor = 1 [deprecated = true];

  // The token representing the payment method that will be used to pay
  // for this booking. This token can be only used once. This token can be
  // only used for the merchant associated with this booking.
  //
  // Each processor may choose its own format for this field.
  // An example of Stripe's token is "tok_1C3orL2eZvKYlo2CxReMgS4K".
  //
  // Replaced by unparsed_payment_method_token, which contains
  // payment_method_token as one of its fields.
  // For example, for Stripe, unparsed_payment_method_token is a serialized
  // JSON object documented at https://stripe.com/docs/api#token_object.
  // payment_method_token is the 'id' field parsed out of that.
  string payment_method_token = 2 [deprecated = true];

  // The full token received from Google Payments.  This is typically a
  // serialized JSON object.  See documentation from Google Payments and your
  // payment processor for the JSON format of the token for your processor.
  // https://developers.google.com/pay/api/#participating-google-pay-processors
  //
  // This token can only be used once, and only for the merchant associated with
  // this booking.
  string unparsed_payment_method_token = 5;

  // The payment processor API version that the given payment token is valid
  // for.
  //
  // Each processor may choose its own format for this field.
  // Stripe uses a date (e.g. "2017-06-15"). (required)
  string version = 3;

  // The payment processor whose configuration was used to generate this token.
  // (required)
  string payment_processor = 4;
}

enum PaymentOptionType {
  PAYMENT_OPTION_TYPE_UNSPECIFIED = 0;
  PAYMENT_OPTION_SINGLE_USE = 1;
  PAYMENT_OPTION_MULTI_USE = 2;
  PAYMENT_OPTION_UNLIMITED_USE = 3;
}

// This describes a payment option, such as a pack, membership, or
// single-session pass after it has been purchased by a user. It includes an
// identifier for the user payment option, as well as some information about
// the payment option with which it is associated.
message UserPaymentOption {
  // A unique identifier for the user payment option. This Id MUST be unique
  // for all UserPaymentOptions across all merchants and users. (required)
  string user_payment_option_id = 1;
  // The user payment option will be valid (usable) between start_time and
  // end_time set in UTC. Attempts to use a user payment option to make a
  // booking outside of this interval will fail. (both optional)
  int64 valid_start_time_sec = 2;
  int64 valid_end_time_sec = 3;
  // The type of the payment option associated with this user payment option.
  // This can be unlimited for a membership or subscription, multi-use for a
  // pack, or single-use. (required)
  PaymentOptionType type = 4;
  // The original number of uses for this user payment option when it was
  // purchased. This value is ignored for unlimited payment options. (required)
  int32 original_count = 5;
  // The number of uses remaining for this user payment option. If this number
  // is 0 for a pack, attempts to use this payment option to make a booking will
  // fail. (required)
  int32 current_count = 6;
  // The id of the payment option that has been used to purchase this user
  // payment option. (required)
  string payment_option_id = 7;
}

// Payment details that are sent when creating a new booking.
message PaymentInformation {
  // Prepayment status of the booking.
  // If the prepayment_status is PREPAYMENT_PROVIDED, then
  // payment_transaction_id contains the associated unique transaction id for
  // the purchase.
  // If the prepayment status is PREPAYMENT_REFUNDED, then
  // payment_transaction_id contains the associated unique transaction id for
  // the refund. (required)
  PrepaymentStatus prepayment_status = 1;

  // Unique identifier for a payment transaction associated with the booking.
  // If the payment is PROCESSED_BY_GOOGLE, this field will be set by Google.
  // If the payment is PROCESSED_BY_PARTNER, this field will be left empty in
  // Google's CreateBooking or CreateOrder requests to the partner, and it must
  // be set by the partner in their responses.
  string payment_transaction_id = 2;

  // These fields must match the service price (specified in the Services feed)
  // or the PaymentOption corresponding with this service.
  // They are included in the booking request and response to verify that
  // the price indicated in the feed has not changed since the last feed
  // update.
  //
  // The price of the booking or order, exclusive of any taxes.
  // Existence of price or taxes does not imply that they have been paid,
  // prepayment_state should be used for that purpose. (required)
  Price price = 3;
  // Taxes that are calculated to be paid for this booking.
  // This field can only be absent in one of the following cases:
  // (1) the price is exempt from or already inclusive of applicable taxes; or
  // (2) the break down between taxes and fees is not available.
  // (required when neither of the above holds)
  Price tax_amount = 4;

  // Who handles payment processing?
  // If payment is processed by the partner, CreateBooking request will
  // include additional parameters (PaymentProcessingParameters) indicating
  // the payment method to be used to process the payment.
  enum PaymentProcessedBy {
    PAYMENT_PROCESSED_BY_UNSPECIFIED = 0;
    PROCESSED_BY_GOOGLE = 1;
    PROCESSED_BY_PARTNER = 2;
  }
  // Whether the partner or Google processed the payment. (required)
  PaymentProcessedBy payment_processed_by = 5;

  // The id of the payment option or user payment option associated with the
  // booking.
  // If a payment option is purchased as part of a booking, payment_option_id
  // will be set with the id of that payment option.
  // If an already purchased user payment option is being used to pay for a
  // booking, user_payment_option_id will be set with the id of that user
  // payment option.
  // When included as part of a response proto, the user_payment_option_id
  // should be set and must match the UserPaymentOption that is returned in the
  // RPC response (e.g. the user_payment_option returned in
  // CreateBookingResponse). (one of these required)
  oneof payment_id {
    // The id of the payment option associated with this booking. If this field
    // is populated, price (and tax_amount, if applicable) must be  populated as
    // well.
    string payment_option_id = 6;

    // The id of the user payment option used to pay for this booking.
    string user_payment_option_id = 7;
  }
  // Defines how a deposit may be charged to the user. If there is a deposit,
  // this field should be set. (optional)
  Deposit deposit = 8;
  // Defines a no show fee that may be charged to the user. If the user can be
  // charged a no show fee, this field should be set. (optional)
  NoShowFee no_show_fee = 9;

  // Total processing fees & taxes that the user needs to pay for the order;
  // only applicable to partners that handle order based booking (e.g., with
  // CreateOrder method). (optional)
  Price fees_and_taxes = 10;
}

// Prepayment status of a booking.
// Updating payment status will trigger an update on the payment status of the
// associated booking (if applicable).
// Currently, the only supported transition is from PREPAYMENT_PROVIDED to
// PREPAYMENT_REFUNDED, which will initiate a non-reversible refund on the
// associated payment transaction.
enum PrepaymentStatus {
  // Not specified, defaults to PREPAYMENT_NOT_PROVIDED.
  PREPAYMENT_STATUS_UNSPECIFIED = 0;
  // The fee for the booking has been paid in advance.
  PREPAYMENT_PROVIDED = 1;
  // The fee for the booking has not been paid in advance.
  PREPAYMENT_NOT_PROVIDED = 2;
  // The fee was previously PREPAYMENT_PROVIDED but has now been refunded.
  PREPAYMENT_REFUNDED = 3;
  // The fee was previously PREPAYMENT_PROVIDED but now has been credited
  // (user given a UserPaymentOption as a voucher for the booking).
  // If this is set, the response should also include the updated
  // UserPaymentOption.
  PREPAYMENT_CREDITED = 4;
}

// The price of a service or a fee.
message Price {
  // The price in micro-units of the currency.
  // Fractions of smallest currency unit will be rounded using nearest even
  // rounding. (e.g. For USD 2.5 cents rounded to 2 cents, 3.5 cents rounded to
  // 4 cents, 0.5 cents rounded to 0 cents, 2.51 cents rounded to 3 cents).
  // (required)
  int64 price_micros = 1;
  // The currency of the price that is defined in ISO 4217. (required)
  string currency_code = 2;
  // An optional and opaque string that identifies the pricing option that is
  // associated with the extended price. (optional)
  string pricing_option_tag = 3;
}

// Defines how a total price is determined from an availability.
enum PriceType {
  // The price is for a fixed amount. This is the default value if the field is
  // not set.
  FIXED_RATE_DEFAULT = 0;
  // The price specified is per person, and the total price is calculated
  // according to the party size specified in Resources as
  // price_micros * party_size. A PER_PERSON price must be accompanied by a
  // party size in the availability resources. If it is not, a party size of one
  // is used.
  PER_PERSON = 1;
}

// A fee that a user may be charged if they have made a booking but do not
// show up.
message NoShowFee {
  // The amount the user may be charged if they do not show up for their
  // reservation.
  Price fee = 1;

  // Defines how the fee is determined from the availability.
  PriceType fee_type = 3;
}

// A deposit that the user may be charged or have a hold on their credit card
// for.
message Deposit {
  // Deposit amount.
  Price deposit = 1;

  // Minimum advance cancellation for the deposit.
  int64 min_advance_cancellation_sec = 2;

  // Defines how the deposit is determined from the availability.
  PriceType deposit_type = 3;
}

// Slot specification

// An inventory slot
message Slot {
  // ID of the merchant for the slot (required)
  string merchant_id = 1;

  // ID of the merchant Service (required)
  string service_id = 2;

  // Start time of the appointment slot in seconds of UTC time since Unix epoch.
  // (required)
  int64 start_sec = 3;

  // Duration of the appointment slot (required)
  int64 duration_sec = 4;

  // Opaque tag that identifies the availability slot and matches the value
  // provided in the availability feed (optional)
  string availability_tag = 5;

  // The set of resources that disambiguates the appointment slot, e.g. by
  // indicating the staff member and room selected by the user (optional)
  ResourceIds resources = 6;
}

// User specification

// Personal information about the person making a booking
message UserInformation {
  // Unique ID of the user to the partner, chosen by Reserve with Google.
  // (required)
  string user_id = 1;

  // Given name of the user (maximum 40 characters) (required)
  string given_name = 2;

  // Family name of the user (maximum 40 characters) (required)
  string family_name = 3;

  // Address of the user (optional)
  PostalAddress address = 4;

  // Phone number of the user (required)
  string telephone = 5;

  // Email address of the user (required)
  string email = 6;
}

// The postal address for a merchant.
message PostalAddress {
  // The country, e.g. "USA". (required)
  string country = 1;
  // The locality/city, e.g. "Mountain View". (required)
  string locality = 2;
  // The region/state/province, e.g. "CA". (required)
  string region = 3;
  // The postal code, e.g. "94043". (required)
  string postal_code = 4;
  // The street address, e.g. "1600 Amphitheatre Pkwy". (required)
  string street_address = 5;
}