Root causes identified from logs:
1. All params (login, password, cmd, email, etc.) were appended to the URL
query string; phpList REST API v3 expects them in the POST body.
wp_remote_post now sends body=>$params instead of an empty body.
2. subscriber_get_by_email and subscriber_add called rawurlencode() on the
email before passing it to call(), which then ran http_build_query() on
it again — double-encoding '@' to '%2540'. Both rawurlencode() calls
removed; wp_remote_post handles POST body encoding correctly.
Additional improvements:
- endpoint_url() returns just the bare ?page=call&pi=restapi URL
- On API error, log full_response (entire JSON) not just the message field,
so phpList's exact reply is always visible in WC Status Logs
- Non-JSON response now gives an explicit error message pointing to the
endpoint URL / credentials rather than a generic JSON parse failure
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Malin
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