this app secren for payment:
I want to pair these buttons with Huawei iap
- huawei iap code : https://developer.huawei.com/consumer/en/codelab/HMSInAppPurchase/index.html#6 -i watched many videos i tried but it doesn't work somtimes i dont find anything related or explanation doesn't get me to the point so please help me if u can and thank you.

You can create multiple offerings in the PMS. According to the buttons you give, you can create offerings with the same price in the PMS. 0.99$,1.99$,2.99$,4.99$ Four items.
If your offering is a consumable offering (that is, the offering can be purchased multiple times after being used), you can create a consumable offering. After purchasing the consumable offering, you need to invoke the consumption interface. That way, you can continue to purchase the item next time.