Please go to the check-in counter along with the card holder to check-in for the flight along with the necessary documentation and credit card used to make the payment. The check-in agent will be able to verify the payment card there and issue your boarding pass. Note that you will not be able to download a mobile boarding pass if you have to verify your credit card at the check-in desk.
Please make sure that you allow extra time at the airport for the credit card verification process. If you miss your flight, cancellation penalties may apply in accordance with the terms and conditions of your ticket.
If you are travelling from an airport that does not authorise non-travelers to enter the airport, please ensure that the credit card verification is completed prior to departure.
For further enquiries contact your local offices, contact details can be found in the following link https://www.qatarairways.com/en/worldwide-offices.html