You've paid for or renewed your Pro or Diamond Pro plan and the app still behaves as if you had no subscription: your plan doesn't show as active and your videos still come out the same as on the free plan. Don't worry: your payment hasn't been lost. It's almost always an account or sync mismatch that can be solved with these steps.
Fix it in 5 steps
Check the email you're logged in with. It's the number one cause: the subscription is activated on the account you paid with. If you log in with another email (personal vs. work, Gmail vs. Apple), the app won't find your plan. Log out and log in with the same email used for the payment.
Tap "Refresh subscription" in your profile inside the app. This forces the app to check the status of your plan again.
On iOS, use "Restore purchases" if that option appears. It re-links the purchases made in the App Store to your Apple ID.
Wait a few minutes if you just paid. Stores and payment gateways can take a little while to confirm the transaction. A short wait and a new "Refresh subscription" are usually enough.
Verify that the payment was completed. Look for the receipt in your email: it's sent by Apple, Google or Stripe depending on where you bought. If there's no receipt, the payment may not have been processed.
If it still doesn't activate
Write to us in this same chat indicating the email you paid with and attaching the purchase receipt. With those two pieces of information we can locate your subscription and activate it on your account.
This related guide may also help you: Problems with subscription activation.