Web Developer Needed for Custom Car Wash Membership Checkout with Sonny’s API

I own a car wash in Kirkland, WA, and I’m looking for a front and backend web developer to build a custom online membership checkout page for our existing website. The checkout page will allow customers to purchase monthly recurring car wash memberships online. It needs to connect with Sonny’s CarWash Controls using their ECommerce API and BackOffice Data API. The project includes membership plan selection, customer information collection, recurring membership checkout, payment integration, Apple Pay and Google Pay integration, a confirmation/receipt page, and a secure backend API connection to Sonny’s. This is not just a basic design project. I need someone who has experience with custom API integrations, ecommerce checkout flows, recurring billing, and secure payment handling. I already have the Sonny’s API documentation available. Local to the Seattle/Bellevue/Kirkland area is preferred, but I’m open to remote if you have the right experience. Please include examples of similar API, payment, or ecommerce checkout projects you’ve completed.