How to use a USER property longer than 30 chars in a URL object when using the URL object in PutAtta

I am writing an App Engine program to send files via SFTP to an external party. I have set up the connection details in a URL object. The username issued by the external party is 36 characters long. I was able to save this username in the URL Object in the USER url property.

The App Engine PeopleCode is using the PutAttachment() Built-In function to send the files via SFTP. It fails with the error: SetURLProperties (error): User Id exceeds 30 characters.

I was also having this issue with the PASSWORD property too, as the external party only auto generates passwords that are 32 characters in length. The error message was: SetURLProperties (error): Password exceeds 30 characters.