Cause
The source given in source_code does not exist or is inactive.
What to do
Use a current source_code.
application/problem+json
{
"type": "https://masnet.com/developers/errors/source_not_found",
"title": "Source not found",
"status": 422,
"detail": "...",
"code": "source_not_found",
"correlation_id": "..."
}