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You must fill in the input fields as follows:
- Endpoint URL: https://your-whmcs-domain.com/modules/gateways/callback/dplstripe_alipaywechat.php
After clicking "Add endpoint", Stripe will redirect you to the overview page of the webhook. Click the button "Click to reveal" at "Signing secret", you need to insert this value at the WHMCS payment configuration page ("Webhook Secret Signature").