# 16. Payment Product Management

- [1. Product List](https://paywall.gitbook.io/en/payment-service/16.-payment-product-management/1.-product-list.md): You can access the list of products sent during payment in Paywall through this service. If you have not provided the Paywall ID information for each product, this service will return the list for you
- [2. Shipping Cost](https://paywall.gitbook.io/en/payment-service/16.-payment-product-management/2.-shipping-cost.md)
- [1. Get Shipping Cost](https://paywall.gitbook.io/en/payment-service/16.-payment-product-management/2.-shipping-cost/1.-get-shipping-cost.md): You can check the shipping cost for the payment's product. Shipping details must be provided to Paywall either at the time of the payment request or afterward.
- [2. Define Shipping Cost](https://paywall.gitbook.io/en/payment-service/16.-payment-product-management/2.-shipping-cost/2.-define-shipping-cost.md): Just as you can provide the shipping cost during payment, if you learn the shipping cost from the shipping provider after X days, you can send the related cost to Paywall through this service.
- [3. Discount](https://paywall.gitbook.io/en/payment-service/16.-payment-product-management/3.-discount.md)
- [1. Get Discount Information](https://paywall.gitbook.io/en/payment-service/16.-payment-product-management/3.-discount/1.-get-discount-information.md): You can retrieve the discount information applied to the payment's product again through this service.
- [2. Define Discount](https://paywall.gitbook.io/en/payment-service/16.-payment-product-management/3.-discount/2.-define-discount.md): You can define discounts for your products not only at the time of payment but also afterward.
- [4. Merchant Earnings](https://paywall.gitbook.io/en/payment-service/16.-payment-product-management/4.-merchant-earnings.md)
- [1. Increase Earnings](https://paywall.gitbook.io/en/payment-service/16.-payment-product-management/4.-merchant-earnings/1.-increase-earnings.md): You can increase the \`MemberEarning\` value you defined for the product after payment (before confirmation) using this method.
- [2. Decrease Earnings](https://paywall.gitbook.io/en/payment-service/16.-payment-product-management/4.-merchant-earnings/2.-decrease-earnings.md): You can decrease the \`MemberEarning\` value you defined for the product after payment (before confirmation) using this method.