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 warnings about the OPcache PHP extension.
Troubleshoot and resolve problems due to PayPal® Instant Payment Notification (IPN) failures.
PayPal payment gateways may generate specific subscription log entries.