Accept payments with Square using Next.js App Router

Summary

This article outlines the steps to integrate Square payment processing into a Next.js application using the new App Router and Server Actions. It begins by installing the necessary SDK and setting up a payment form using React components from the react-square-web-payments-sdk. The guide then explains how to handle payment processing on the server side using a Server Action, which simplifies the code by eliminating the need for separate API routes. Additionally, it addresses potential serialization issues with BigInt values in JSON, providing a solution to ensure smooth payment processing.

Key Learnings

• 1How to set up a payment form in a Next.js application using Square's SDK.
• 2The advantages of using Server Actions in Next.js for handling server-side logic directly from React components.
• 3How to manage payment tokenization and processing securely on the server side.
• 4Understanding the implications of BigInt serialization in JSON and how to implement a custom toJSON method.

Who Should Read This

Frontend Engineers with intermediate experience looking to implement payment solutions in Next.js applications.

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