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In addition to adding that string to the Registration section would I also want to include it in the EOT deletion notifications? Would I need to make any modification or use it as is?
I’m not familiar with GetResponse, so I would recommend checking what is required to denote a cancellation for GetResponse’s handler. I doubt that the URL that you’re currently using would work correctly. If you’d like to post the URL that should be sent the information, I’d be happy to point you in the right direction here.
Also, can I still have different lists for each level using the API notification?
I have Level 0 and Level 1 with several custom capabilities. I know I can’t have different lists for custom capabilities but a different list for Level 1 would be good.
I believe you could probably distinguish different level Users either by passing s2Member’s %%item_number%% variable to GetResponse.
From the docs
(Dashboard -› s2Member® -› API / Notifications -› Payment Notifications):
%%item_number%% = The Item Number (colon separated level:custom_capabilities:fixed term) that the payment is for. [ ? ]