Does Mailchimp integration no longer work? I have two sites where I’m testing subscribers being added to their respective Mailchimp lists.
I’m using s2member Pro, and have both Stripe and Paypal buttons set up on one site, Paypal only on the other. Stripe is used on the first site for Pro Forms and I’m using Paypal for Specific Page/Post Access. The second site uses PayPal Pro Forms.
I’ve set the API key and List ID in both instances. The double opt-in was off for both. The s2member Mailchimp log was providing a lot of detail including  => HTTP/1.0 400 Bad Request in some instances.
I recently enabled double optin for one (in both s2member and Mailchimp settings) but doesn’t do anything different.
The last section in the log is:
[api_email_type] => html
[api_double_optin] => 1
[api_update_existing] => 1
[api_replace_interests] => 1
So it looks like the double optin setting is recognised, but no send welcome or api response.
At the moment I am exporting user data and manually importing into Mailchimp, but obvs this is not the ideal.