PWA App Payment Gateway Integration

Hello, I built a PWA app using google AI studio build. I have managed to link it to STRIPE, and built a weblink via google cloud. I am new to this and have now knowledge of apps/coding however am nearly at the final stage of my project. I would like to get the payment link sorted so that I can take payment as a one-off payment to unlock the app or a subscription package. Currently is a PWA hosted on google but at some point will also like this to be a apple/android app (payment is priority at this point in time). I need a webhook link up so that the app knows that the payment has been collected and unlocks the app. I need to get this to a live product asap and any touch ups of the app and debugging will be welcome. I have been looking for someone with the knowledge who would be able to review my project and be able to resolve confidently. This is the start of a potentially a long-term partnership as I have other work to get completed however have not been able to find the right person. Look forward to hearing from you.