It's simple, follow the steps below, depending on the app you're using.
Qovex Pro App
Select “Quick Buy”
Select currency you would like to buy or sell
Select coin you want to buy or sell
Select in payment methods Apple Pay or Google Pay
Qovex App
Select “+” on your dashboard or “-”
Select coin you would like to buy or sell
Enter the amount
Select Apple Pay or Google Pay as payment method