A. 1. Verify payment information: Double-check that your payment details are entered correctly, including card number, expiration date, and CVV. 2. Ensure sufficient funds: Make sure that your payment method has enough funds available to complete the transaction. 3. Restart the app: Close the app completely and reopen it to refresh the session.

B. 4. Try a different payment method: If possible, use an alternative payment method to see if the issue persists.