post:
  operationId: PostCartsCartPaymentSession
  summary: Select a Payment Session
  description: >-
    Selects a Payment Session as the session intended to be used towards the
    completion of the Cart.
  parameters:
    - in: path
      name: id
      required: true
      description: The ID of the Cart.
      schema:
        type: string
  tags:
    - Cart
  responses:
    '200':
      description: OK
      content:
        application/json:
          schema:
            properties:
              cart:
                $ref: ../components/schemas/cart.yaml
  requestBody:
    content:
      application/json:
        schema:
          type: object
          required:
            - provider_id
          properties:
            provider_id:
              type: string
              description: The ID of the Payment Provider.