Make sure to troubleshoot and resolve any issues with payment gateways, payments, currencies, or related features as soon as possible.
WHMCS includes several supported payment gateway modules for accepting payments through PayPal®, including the new PayPal Payments gateway.
Disputes, including chargebacks, inquiries, or retrievals, occur when a client contests charges that you collected from their card issuer.
Troubleshoot and resolve issues with DUPLICATE_INVOICE_ID errors.
Troubleshoot and resolve problems with PayPal® payments that succeeded in your PayPal account but that do not appear in WHMCS.
Troubleshoot and resolve problems with missing PayPal® subscriptions.
Troubleshoot and resolve warnings about the OPcache PHP extension.