Changes to Sign Up

the request property referrer became not nullable

the request property source became not nullable

api tag agent added

api tag Agent removed

request body became optional

the request property human_email became optional

added the optional property code to the response with the 400 status

added the optional property docs to the response with the 400 status

added the optional property fix to the response with the 400 status

added the optional property message to the response with the 400 status

added the new optional request property referrer

added the new optional request property source

endpoint added

api path removed without deprecation

endpoint added