Changes to Create a new activeflow

added the new optional request property webhook_method

added the new optional request property webhook_uri

added the optional property webhook_method to the response with the 200 status

added the optional property webhook_uri to the response with the 200 status

removed the success response with the status 201

added the success response with the status 200

added the new optional request property variables

removed the success response with the status 200

removed the request property variables

removed the request property webhook_method

removed the request property webhook_uri

added the success response with the status 201