An e-commerce software company wanted merchants to offer a post-purchase upgrade without asking buyers to repeat their details. Mark Philippe Mirasol built the Shopify application and the server-side workflow that turned acceptance into an order.
The application worked on Shopify’s hosted checkout, where behavior depends on the platform as well as the app. It needed to support payment providers and create a valid order when a buyer accepted an additional offer.
Requiring another full checkout would repeat information the customer had already supplied. The backend needed to reuse the right order and address data while keeping payment handling consistent.
Mark built the PHP and Laravel application with an API documented for the client’s team. The implementation connected PayPal and Stripe with checkout customization and one-click upsell or downsell acceptance.
The server assembled the resulting order from the original line items and billing and shipping information. Checkout behavior was checked against real hosted sessions because a local mock could not reproduce the complete platform interaction.
Project materials showing the workflows and interfaces described in this case.
The application connected a customer’s acceptance to server-side order creation. The delivery included both the checkout behavior and the documented backend used to turn it into a business transaction.
A checkout integration depends on platform APIs, payment configuration and the rules for creating and reconciling orders. A takeover must check those dependencies against the platform version in use today. Preserving the business flow matters more than preserving an obsolete implementation detail.
Project contribution: Mark Philippe Mirasol. The scope described above identifies the work behind this case.
Editorial review: Ego Eimi · Updated September 6, 2026 · About the team
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