Sign up a new donor

curl --request GET \
  --url https://api.helpyousponsor.com/v1/frontend/signup_donor/{client_id}/{program_id}/{session_id}

{
  "status": "<string>",
  "data": {
    "session_id": "<string>",
    "client_id": 123,
    "program_id": 123,
    "fields": [
      {}
    ]
  }
}