Allow integrator to define source/interface IP + json header update#326

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Commits on Sep 18, 2025

Implemented third `MailChimp::__construct()` parameter `$source_ip` (defaults to null for backward compatibility) which allows an integrator to set an override interface IP address to in the CURL r…
RickKukiela
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Changed the `Accept` and `Content-Type` headers used in the CURL request to the standard `application/json` value. While this is not currently causing an issue, MailChimp's API is plain REST with J…
RickKukiela
committed