📘 Guide: Add Cashfree/Stripe-style autopilot payments to MyBB

📘 The DF Guide — autopilot payments

Principle: pay → verified server-side → instant upgrade. Zero PMs.

1. Create order row (pending) before checkout.
   
2. Redirect to hosted checkout.
   
3. Webhook/verify: signature check with your secret — never trust the client.
   
4. On PAID: flip usergroup, log, PM receipt.
   
5. Failures: keep order pending; retry page for the buyer.
   

Our DF Payment Gateway (Vault) ships this for MyBB; the Cashfree XF version covers XenForo.

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