支付通道：BitCoin

参考：https://marketplace.whmcs.com/product/4029-whmcs-bitcoin-payments

视频：https://www.youtube.com/watch?v=jORcxsV-OOg
手册：https://blog.blockonomics.co/friendly-bitcoin-payments-for-web-hosting-businesses-using-whmcs-88de8eef4e81

支付通道：Stripe （信用卡）

参考：https://docs.whmcs.com/Stripe
参考：https://docs.whmcs.com/Stripe_ACH

参考：https://stripe.com/partners/whmcs

参考：https://blog.whmcs.com/133563/feature-spotlight-stripe-in-whmcs-78

The WHMCS Official Stripe module was introduced in WHMCS 7.1. And is now improved in our latest release, with the support of Stripe Elements and 3D Secure natively in WHMCS.

也即：WHMCS官方已集成Stripe支付。

支付通道：PayPal

支付通道：易支付

支付通道：2checkout , Stripe , Authorize.net / payoneer

Payoneer is for receiving payments but can be used 2checkout as payment bridge a payoneer

下载：https://scriptznull.nl/threads/stripe-checkout-v3-1-1-whmcs-5-3-6-3-1.27596/
参考：https://scriptznull.nl/forums/whmcs-addon.53/page-2

支付接口：支付宝

参考：https://www.mrkevin.net/share/1635.html
参考：https://blog.csdn.net/stocky1234/article/details/84529779
参考：https://ctolib.com/article/compares/93603
参考：https://lowvps.cn/whmcs-gateways-alipay/