Hello,
I cannot reproduce the issue you are reporting with the default settings for Wordfence. In my installation it does not block the API endpoint for the CoinPayments IPN.
However here’s something you can try:
1. Go to Admin → Wordfence → Firewall → Whitelisted URLs
2. Enter the following:
URL: /
Param Type: query string
Param Name: wallets-cp-ipn
This should whitelist that request.
Alternatively, use the firewall’s “learning mode” while performing a deposit and it should create a rule. Learning mode can be enabled under “Basic Firewall Options” → “Web Application Firewall Status”
If you try this, can you please report here what you found?
Thank you.