How to create new SMS cloud function (low-level instruction)

openapi: 3.0.0
info:
  version: 1.0.0
  title: Test function API
  description: Test function API

servers:
  - url: https://oracleclouddomain/deploymentpath

paths:
  /function_endpoint:
    post:
      description: Invoke function
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object 
              required:
                - dst_phone
                - src_phone
                - auth_info
                - message
              properties:
                dst_phone:
                  type: string
                  description: The phone number of the SMS reciever.
                src_phone:
                  type: string
                  description: 'The representation of the source number on the vendor side. Note: for the SMS provider Twilio, this phone is provided in the Account Info section.'
                message:
                  type: string
                  description: The text of the message to send.
                auth_info:
                  type: object
                  description: The credentials required for the SMS provider authorization.
                  required:
                    - token
                    - login
                    - password
                  properties:
                    token:
                      type: string
                      description: 'The token required for the SMS provider authorization. Note: for the SMS provider Twilio, this token is provided in the Account Info section.'
                    login:
                      type: string
                      description: 'The login required for the SMS provider authorization. Note: for the SMS provider Twilio, this is the Account SID value, provided in the Account Info section.'
                    password:
                      type: string
                      description: 'The password required for the SMS provider authorization. Note: for the SMS provider Twilio, the password is not required.'
      responses:
        '200':
          description: Success response
          content:
            application/json:
              schema:
                type: object
                properties:   
                  success:
                    type: boolean
                    description: True for success, false in case of failure
        '400':
          description: Client error response
          content:
            application/json:
              schema:
                type: object
                properties:   
                  success:
                    type: boolean
                    description: True for success, false in case of failure.
                  error:
                    type: string
                    description: Contains the error message in case of client error.
        '500':
          description: Server error response
          content:
            application/json:
              schema:
                type: object
                properties:   
                  success:
                    type: boolean
                    description: True for success, false in case of failure.
                  error:
                    type: string
                    description: Contains the error message in case of server error.

curl -k -X POST <functions endpoint> -H "Content-Type: application/json" -d'{
        "dst_phone": "+38NNN555NNNN",
        "src_phone": "+1NNN555NNNN",
        "message": "Test message",
        "auth_info": {
            "token": "bbaabe325689e3578ec10d047a7d08728",
            "login": "ACf2700aaaa18e2191334b3594807fffff",
            "password": "fwoejgforeghureh1233"
        }
}'

{
    "error": "The login is missing. The login should be equal to the Twilio account SID.",
    "success": false
}

{
    "success": true
}