When making a purchase in the Plarium Play app, you can save your credit card for future use. Subsequently, you will be able to select the card without entering your payment data or adding another one.
To remove your credit card from the Plarium Play app:
1. Go to your Profile
2. Open Settings
3. Click Payment method
4. Click 'X' next to the payment card you want to remove
5. Confirm your action
Microsoft Store users can find the instructions in the article Remove a Microsoft account payment method.