openapi: 3.2.0
info:
  version: 1.7.57
  title: Shift4 Payment Checkout Sessions API
  contact:
    url: https://www.shift4.com/contact-us/
servers:
- url: https://api.shift4test.com/api/rest/v1
  description: Host Direct Test URL
- url: https://api.shift4api.net/api/rest/v1
  description: Host Direct Production URL
tags:
- name: Checkout Sessions
paths:
  /checkoutsessions/list:
    get:
      servers:
      - url: https://api.shift4.com/api/rest/v1
        description: Host Direct URL
      tags:
      - Checkout Sessions
      summary: List Checkout Sessions
      operationId: checkoutsessionslist
      security:
      - AccessToken: []
      description: "Used to retrieve a list of checkout sessions via the Payment Links system\n\n **Integration Methods:**\n- Host Direct\n\nSee the [Integration Methods](/guides/quickstart#integration-methods) and [URLs Section](/guides/quickstart#urls) sections of the Development Quick Start guide for details regarding each processing option.\n"
      parameters:
      - $ref: '#/components/parameters/InterfaceVersion'
      - $ref: '#/components/parameters/InterfaceName'
      - $ref: '#/components/parameters/CompanyName'
      - $ref: '#/components/parameters/AccessToken'
      - $ref: '#/components/parameters/PaymentLinksLimit'
      - $ref: '#/components/parameters/PaymentLinksStartingAfterId'
      - $ref: '#/components/parameters/PaymentLinksEndingBeforeId'
      - $ref: '#/components/parameters/PaymentLinksDateTimeAfter'
      - $ref: '#/components/parameters/PaymentLinksDateTimeBefore'
      - $ref: '#/components/parameters/PaymentLinksIdOptional'
      - $ref: '#/components/parameters/CheckoutSessionsStatus'
      responses:
        '200':
          description: Request was processed
          content:
            application/json:
              schema:
                properties:
                  hasMore:
                    $ref: '#/components/schemas/PaymentLinksHasMore'
                  result:
                    type: array
                    items:
                      type: object
                      properties:
                        dateTime:
                          $ref: '#/components/schemas/PaymentLinksDateTime'
                        paymentLink:
                          type: object
                          properties:
                            id:
                              $ref: '#/components/schemas/PaymentLinkId'
                        checkoutSession:
                          $ref: '#/components/schemas/CheckoutSessionResponse'
        '400':
          $ref: '#/components/responses/ErrorResponse'
        '504':
          $ref: '#/components/responses/TimeoutResponse'
  /checkoutsessions/retrieve:
    get:
      servers:
      - url: https://api.shift4.com/api/rest/v1
        description: Host Direct URL
      tags:
      - Checkout Sessions
      summary: Retrieve Checkout Session
      operationId: checkoutsessionsretrieve
      security:
      - AccessToken: []
      description: "Used to retrieve a single checkout session via the Payment Links system\n\n **Integration Methods:**\n- Host Direct\n\nSee the [Integration Methods](/guides/quickstart#integration-methods) and [URLs Section](/guides/quickstart#urls) sections of the Development Quick Start guide for details regarding each processing option.\n"
      parameters:
      - $ref: '#/components/parameters/InterfaceVersion'
      - $ref: '#/components/parameters/InterfaceName'
      - $ref: '#/components/parameters/CompanyName'
      - $ref: '#/components/parameters/AccessToken'
      - $ref: '#/components/parameters/CheckoutSessionsId'
      responses:
        '200':
          description: Request was processed
          content:
            application/json:
              schema:
                properties:
                  result:
                    type: array
                    items:
                      type: object
                      properties:
                        dateTime:
                          $ref: '#/components/schemas/PaymentLinksDateTime'
                        checkoutSession:
                          $ref: '#/components/schemas/CheckoutSessionResponse'
        '400':
          $ref: '#/components/responses/ErrorResponse'
        '504':
          $ref: '#/components/responses/TimeoutResponse'
webhooks:
  checkoutsessions-notification:
    post:
      servers:
      - url: https://api.merchant.com
      tags:
      - Checkout Sessions
      summary: Checkout Sessions Notification
      description: 'This is an outbound HTTP POST message from the Shift4 gateway to the merchant''s environment that provides a status of the checkout session. This notification request will be sent from Shift4 to the URL provided in the merchant''s boarding configuration.


        This requires the interface vendor to establish a listening service to receive these requests.

        '
      operationId: checkoutsessionsnotification
      security:
      - {}
      requestBody:
        content:
          application/json:
            schema:
              properties:
                event:
                  type: object
                  properties:
                    type:
                      type: string
                      enum:
                      - checkout_session_completed
                      description: 'Occurs when the status of the Checkout Session is updated.


                        | Value                                   | Description                                       |

                        |-----------------------------------------|---------------------------------------------------|

                        | checkout_session_completed              | Checkout session has been completed.              |

                        '
                dateTime:
                  $ref: '#/components/schemas/PaymentLinksDateTime'
                paymentLink:
                  type: object
                  properties:
                    id:
                      $ref: '#/components/schemas/PaymentLinkId'
                checkoutSession:
                  $ref: '#/components/schemas/CheckoutSessionResponse'
      responses:
        '200':
          description: 'Return 200 status to indicate that the Notification was received successfully.

            '
components:
  parameters:
    AccessToken:
      required: true
      name: AccessToken
      in: header
      schema:
        type: string
        format: uuid
        maxLength: 52
        example: EA79FB05-3AA7-4500-AF9A-73F986FF2C1D
      description: 'A security credential used to authenticate API requests and all [i4Go®](https://s4-myportal.s3.amazonaws.com/downloads/documentation/i4go/i4go%20technical%20reference%20guide.pdf) authorizeClient/preauthorizeClient requests. An Access Token is the alias for the merchant account and interface being used. The Access Token is required in all requests except an [Access Token Exchange](/apis/payments-platform-rest/openapi/credentials/accesstokenexchange) request, which generates an Access Token using an `authToken` and `clientGuid`.

        '
    PaymentLinksDateTimeAfter:
      name: DatetimeAfter
      in: header
      schema:
        type: string
        format: ISO 8601
        example: '2024-05-21T09:18:23.283-07:00'
      description: 'Returns only records strictly after the specified timestamp

        '
    PaymentLinksLimit:
      name: Limit
      in: header
      schema:
        type: number
        maximum: 100
      description: 'Maximum number of returned objects

        '
    PaymentLinksDateTimeBefore:
      name: DatetimeBefore
      in: header
      schema:
        type: string
        format: ISO 8601
        example: '2024-05-21T09:18:23.283-07:00'
      description: 'Returns only records strictly before the specified timestamp

        '
    CheckoutSessionsStatus:
      name: Status
      in: header
      schema:
        type: string
        enum:
        - active
        - paid
        - expired
        - failed
      description: 'Filter checkout sessions by their current status. When omitted, all sessions are returned.


        | Value     | Description                                                                                    |

        |-----------|------------------------------------------------------------------------------------------------|

        | `active`  | Session is open — payment not yet completed, not expired, and within the allowed failure count |

        | `paid`    | Payment was completed successfully                                                             |

        | `expired` | Session expired or was deleted without a successful payment                                    |

        | `failed`  | Payment was attempted but reached the maximum number of failed attempts                        |


        An invalid value returns HTTP 400 with error code `invalid_header_format`.

        '
    PaymentLinksIdOptional:
      name: PaymentLinkId
      in: header
      schema:
        type: string
      description: 'Used for selecting payment link by id

        '
    PaymentLinksEndingBeforeId:
      name: EndingBeforeId
      in: header
      schema:
        type: string
      description: 'Cursor used for pagination (getting the previous page). For example, if you make a list request and receive 10 objects, where the first object has `id=some-example-id` - then you can make another request with `endingBeforeId=some-example-id` to get the previous page of that list

        '
    PaymentLinksStartingAfterId:
      name: StartingAfterId
      in: header
      schema:
        type: string
      description: 'Cursor used for pagination (getting the next page). For example, if you make a list request and receive 10 objects, where the last object has `id=some-example-id` - then you can make another request with `startingAfterId=some-example-id` to get the next page of that list.

        '
    CompanyName:
      required: true
      name: CompanyName
      in: header
      schema:
        type: string
        maxLength: 26
        example: PAWS
      description: 'Refers to the vendor or partner that designed and certified the interface. The information you use in this field should match what Shift4 has on file or what was agreed upon in your Integration Plan. The following special characters are not allowed&colon;  $ % &colon; ^ - ~ ` < > , ? “ ” ‘ ’ { } [ ] \ + =

        '
    CheckoutSessionsId:
      name: CheckoutSessionId
      in: header
      required: true
      schema:
        type: string
      description: 'Used for selecting checkout session by id

        '
    InterfaceVersion:
      required: true
      name: InterfaceVersion
      in: header
      schema:
        type: string
        maxLength: 11
        example: '2.1'
      description: 'Refers to the version of the program or application that is sending requests to Shift4. The following special characters are not allowed&colon;  $ % &colon; ^ - ~ < > , ? “ ” ‘ ’ { } [ ] \ + =

        '
    InterfaceName:
      required: true
      name: InterfaceName
      in: header
      schema:
        type: string
        maxLength: 25
        example: ForwardPOS
      description: 'Refers to the name of the program or application that is sending requests to Shift4. This should be the name of the program that you purchased or created. The following special characters are not allowed&colon;  $ % &colon; ^ - ~ ` < > , ? “ ” ‘ ’ { } [ ] \ + =

        '
  schemas:
    PaymentLinksDateTime:
      type: string
      format: ISO 8601
      readOnly: true
      example: '2024-05-21T09:18:23.283-07:00'
      description: 'Date-time when the object was created

        '
    PaymentLinksHasMore:
      type: boolean
      description: 'If the value is true then more objects can be listed by requesting next page

        '
    Error:
      type: object
      properties:
        code:
          $ref: '#/components/schemas/ErrorCode'
        severity:
          $ref: '#/components/schemas/ErrorSeverity'
        shortText:
          $ref: '#/components/schemas/ErrorShortText'
        longText:
          $ref: '#/components/schemas/ErrorLongText'
        primaryCode:
          $ref: '#/components/schemas/ErrorPrimaryCode'
        secondaryCode:
          $ref: '#/components/schemas/ErrorSecondaryCode'
    CheckoutSessionStaticFields:
      type: object
      description: 'List of information displayed on the payment page

        '
      additionalProperties:
        type: string
      example:
        Date of event: 12 April
        Invoice number: ABC2016
    LighthouseResponse:
      type: object
      readOnly: true
      properties:
        data:
          $ref: '#/components/schemas/LighthouseDataResponse'
    ServerName:
      type: string
      maxLength: 50
      example: TM01CE
      description: 'The name of the server that processed the request.

        '
    PaymentLinkId:
      readOnly: true
      type: string
      example: link_8kdskX8DZ8FR6W3acYPXiyAN
      description: 'Identifier of Payment Link

        '
    Server:
      type: object
      readOnly: true
      properties:
        name:
          $ref: '#/components/schemas/ServerName'
    CheckoutSessionResponse:
      type: object
      properties:
        id:
          $ref: '#/components/schemas/CheckoutSessionId'
        staticFields:
          $ref: '#/components/schemas/CheckoutSessionStaticFields'
        customFieldsTitle:
          $ref: '#/components/schemas/CheckoutSessionCustomFieldsTitle'
        customFields:
          $ref: '#/components/schemas/CheckoutSessionCustomFieldsArray'
        lastTransaction:
          $ref: '#/components/schemas/CheckoutSessionLastTransaction'
    ErrorSeverity:
      type: string
      enum:
      - Info
      - Error
      - Alert
      readOnly: true
      example: Info
      description: 'Severity level of the error.


        | Severity | Description                                                       |

        | -------- | ----------------------------------------------------------------  |

        | Info     | Action not required - Data input/formatting is incorrect          |

        | Error    | Action may be required - Communication, timeout or network issue  |

        | Alert    | Action required - System issue                                    |

        '
    ErrorLongText:
      type: string
      maxLength: 255
      readOnly: true
      example: Card type not recognized
      description: 'Extended error message that is returned if an error condition exists.

        '
    ErrorShortText:
      type: string
      maxLength: 16
      readOnly: true
      example: NOT IN CARDRANGE
      description: 'Abbreviated error message that is always returned if an error condition exists

        '
    LighthouseDataResponse:
      type: string
      example: eyJwYXltZW50SWQiOiI4NWM0MWNhNy01NzVjLTQzNGUtODIyZi0xYzZlOTE0ZDAzODYiLCJyZW1haW5pbmdBbW91bnQiOjB9
      description: 'Base64 encoded JSON formatted data that will be returned from Lighthouse to be passed back to SkyTab. This data will contain variable information.

        '
    ErrorPrimaryCode:
      type: integer
      maxLength: 4
      readOnly: true
      example: 9842
      description: 'Code indicating the type of error that occurred. Refer to the [Error Codes](/guides/appendices/error-codes) section of this document for more details.

        '
    CheckoutSessionLastTransaction:
      type: object
      description: 'Contains the API response from the last transaction processed. See the [Sale Response Body](/apis/payments-platform-rest/openapi/transactions/transactionssale#transactions/transactionssale/response&c=200) for the full response structure.

        '
      example:
        result:
        - dateTime: '2024-05-21T09:18:23.283-07:00'
          amount:
            total: '10.99'
            tax: '0.00'
          transaction:
            invoice: 0510093358
            authorizationCode: '198399'
            saleFlag: S
    ErrorCode:
      type: integer
      maxLength: 5
      readOnly: true
      example: 64100
      description: 'Code indicating the type of error that occurred. Refer to the [Error Codes](/guides/appendices/error-codes) section of this document for more details.


        **Note: This is currently only supported for European merchant processing.**

        '
    CheckoutSessionId:
      readOnly: true
      type: string
      example: chse_wMCUGVZgpf45fWHzKbYWMKmZ
      description: 'Identifier of a Checkout Session

        '
    CheckoutSessionCustomFieldsArray:
      type: array
      maxItems: 3
      description: 'List of custom fields that were collected from customer on the payment page

        '
      items:
        type: object
        required:
        - key
        - label
        properties:
          key:
            type: string
            maxLength: 255
            example: special_wishes
            description: 'Identifier of custom field

              '
          label:
            type: string
            maxLength: 20
            example: Special wishes
            description: 'Label of custom field

              '
          optional:
            type: boolean
            description: 'If this flag is set to true, then customer was not required to provide any value for this custom field

              '
          value:
            type: string
            example: Happy Holidays
            description: 'The value that was provided by the customer for this custom field

              '
    ErrorSecondaryCode:
      type: integer
      maxLength: 4
      readOnly: true
      example: 0
      description: 'This code supplements the code specified in the `error.primaryCode` field to provide additional information about the error that occurred.

        '
    CheckoutSessionCustomFieldsTitle:
      type: string
      maxLength: 32
      example: Additional information
      description: 'Title of custom fields section

        '
  responses:
    TimeoutResponse:
      description: Timeout
      content:
        application/json:
          schema:
            properties:
              result:
                type: array
                items:
                  type: object
                  properties:
                    error:
                      $ref: '#/components/schemas/Error'
                    lighthouse:
                      type: object
                      properties:
                        data:
                          $ref: '#/components/schemas/LighthouseDataResponse'
                    server:
                      $ref: '#/components/schemas/Server'
          example:
            result:
            - error:
                primaryCode: 9951
                secondaryCode: 0
                shortText: RESPONSE TIMEOUT
                longText: Timeout waiting for response across the internet
              lighthouse:
                data: eyJwYXltZW50SWQiOiI4NWM0MWNhNy01NzVjLTQzNGUtODIyZi0xYzZlOTE0ZDAzODYiLCJyZW1haW5pbmdBbW91bnQiOjB9
              server:
                name: U2API01CE
    ErrorResponse:
      description: Error
      content:
        application/json:
          schema:
            properties:
              result:
                type: array
                items:
                  type: object
                  properties:
                    error:
                      $ref: '#/components/schemas/Error'
                    lighthouse:
                      $ref: '#/components/schemas/LighthouseResponse'
                    server:
                      $ref: '#/components/schemas/Server'
            example:
              result:
              - error:
                  primaryCode: 9842
                  secondaryCode: 0
                  shortText: NOT IN CARDRANGE
                  longText: Card type not recognized
                lighthouse:
                  data: eyJwYXltZW50SWQiOiI4NWM0MWNhNy01NzVjLTQzNGUtODIyZi0xYzZlOTE0ZDAzODYiLCJyZW1haW5pbmdBbW91bnQiOjB9
                server:
                  name: U2API01CE
  securitySchemes:
    AccessToken:
      type: apiKey
      name: AccessToken
      in: header
      description: "A security credential used to authenticate API requests and all [i4Go®](https://s4-myportal.s3.amazonaws.com/downloads/documentation/i4go/i4go%20technical%20reference%20guide.pdf) authorizeClient/preauthorizeClient requests. An Access Token is the alias for the merchant account and interface being used. \n\nExample:\n  ```\n  AccessToken: EA79FB05-3AA7-4500-AF9A-73F986FF2C1D\n  ```\n"
    HMAC-SHA256:
      type: http
      scheme: hmac-sha256
      description: "Authentication using HMAC-256 signatures as the authorization scheme.\n\nSent in the `Authorization` header in the following format:\n\n`Authorization`: **HMAC-SHA256** `Credential`={value}&`Signature`={value}\n\n| Argument      | Description                                      |\n|---------------|--------------------------------------------------|\n| HMAC-SHA256   | Authorization scheme.                            |\n| Credential    | The ID of the key used to compute the signature. |\n| Signature     | base64 encoded HMACSHA256 value.                 |\n\nExample: \n  ```\n  Authorization: HMAC-SHA256 Credential=AESKEY1&Signature=8SFtIc6zQlswxAZqDKXL+BpRmlDvIWyjOwU8wdl0zK4=\n  ```\n"