IOS transportation App development “like Uber” modifications: integration of payment gateway and maintaining the app. The language used is larvel Php and swift

I am looking to minor develop and maintain a transportation app for iOS “which is almost done” similar to a Uber-like experience. The language used are Laravel PHP and Swift. I have two specific modifications I am wanting to make to the app. Firstly, I want to integrate a payment gateway - I have chosen Stripe. Secondly, I will need to maintain the app regularly - updating it on a regular basis and fixing any bugs or errors that appear. This project is crucial to my business so please only apply if you believe you have the necessary experience to deliver a great outcome. Thank you and I look forward to working with you soon.