post https://{environment}.masspay.io/{VERSION}/payout/user
This POST endpoint is used to create a new user in MassPay.
You can use this endpoint to create a new user with the specified user details in JSON format in the request Body.
To use this endpoint, you need to provide the internal_user_id, country, first_name, last_name, and email as required parameters in the Request Body.
The response will include details about the newly created user.