Understand identity fields collected during DAFpay checkout

For GiveCampus payment setup.

GC validates its configured giving-form fields before opening DAFpay and passes first/last name, email and available address fields into Chariot. The embedded Chariot flow controls its own DAF account/fund identity questions. These are not GC custom required-field settings. The local implementation does not confirm which fund, institution, donor identity or address fields every current DAF provider requires; obtain provider confirmation rather than promising those values are mandatory or always returned.