Hello ChristopherW5602,
Thank you for reaching out to Constant Contact API Developer Support. My team is here to assist outside software developers with questions about building into Constant Contact's API.
The Source column within the Contacts tab of the Website UI is a hard-coded part of the UI that cannot be modified, and will only display pre-populated source types such as "Website sign-up form", "Inline", "Other app", and "Added by you".
The Source label "Other app" indicated that the contact was added via a 3rd party integration or signup form that was developed by a 3rd party using our free public API.
If your intent is to better categorize the sources of contacts being added by your application, you can do so by using one of our other contact management tools, such as Lists, Tags, or Custom Contact Fields, all of which can be modified using the API.
The "create_source" variable in contacts indicates who the contact was added by, and indicates the type of permission given, which ensures that we remain compliant with any applicable laws and regulations in the areas that we offer service.
For example, if you upload a list of contacts, or sync a list of contacts from another platform, you'd want to use "Account" because those contacts were added by you, and you have implied that you have permission to email them. If the contact is being added via a sign-up form, or some alternate method where the contact is the one confirming that they want to be added to a list, you would use "Contact", as the contact has given firsthand permission.
Understanding implied and express permission for CASL and GDPR:
https://knowledgebase.constantcontact.com/articles/KnowledgeBase/5924-implied-and-express-permission-in-casl-regulations
Please have a look and let us know if you have any other questions!
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