You can purchase PDF Reader Pro with your Microsoft account through Microsoft Store. Microsoft account supports multiple payment options such as Debit/Credit cards with the Visa or MasterCard logo, American Express, PayPal, UnionPay, or even Mobile Phone. All the options can vary depending on the region where you choose to purchase.
Add a New Payment Method
1. Select Start on your device, then select Microsoft Store from the apps list;
2. Click on the top-right corner and select Payment Option;
3. Select Add a new payment method;
4. Pick a payment method you want and add your info, and click Save.
If you need to learn more details about payment options, please click here.