Build Payment Plugin for Shopify Checkout and Merchant Admin Panel

Shopify Discussion
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Topic summary

A developer seeks guidance on building a Shopify payment plugin with two main components:

Core Requirements:

  • Inline payment form on checkout page (no redirection)
  • Direct payment processing with confirmation page
  • Merchant admin panel for configuration (API keys, credentials)
  • Plugin activation on checkout when settings are correctly configured

Provided Solution Outline:

A responder (PageFly-Richard) offers a structured approach:

  1. Project Setup: Create Shopify app via Partner Dashboard, set up Node.js development environment
  2. Admin Panel: Build configuration interface with secure settings storage
  3. Checkout Integration: Develop Checkout Extension with payment form, data validation, payment gateway API integration, and response handling

Current Status:

The original poster acknowledges the guidance but expresses uncertainty about implementation and requests video tutorials or step-by-step guides to get started.

Note: Some text in the conversation appears reversed/encoded, suggesting potential formatting issues in the original thread.

Summarized with AI on November 3. AI used: claude-sonnet-4-5-20250929.
1

I want to build a simple Shopify payment plugin where customers can fill out an inline payment plugin on the checkout page and pay the amount directly without any redirection. Upon successful payment, they will be shown a confirmation page.

Additionally, I need a merchant admin panel where the merchant can input configuration details (like API keys or other settings). If the provided field values are correct, the plugin should be activated on the checkout page, allowing the merchant to use our payment method during checkout.

I am new to Shopify app development, and I would appreciate any guidance or resources to help me get started.

2

Hi,

This is Richard at PageFly - Shopify Advanced Page Builder app.

1. Project Setup

  • Create a new Shopify app: Follow Shopify’s documentation to create a new app in your partner dashboard. This will generate a unique app ID and API credentials.
  • Choose a development environment: Set up a local development environment using Node.js, a framework like Next.js or Express.js, and a code editor (VS Code is popular).

2. App Structure

  • Admin Panel:
    • Create an admin panel using your chosen framework. This panel will have:
      • Configuration Page: A form for the merchant to enter their payment gateway API keys, credentials, and other necessary settings.
      • Settings Storage: Implement a mechanism to store the merchant’s configuration settings securely (e.g., using the Shopify App Proxy or a secure database).
  • Checkout Page Integration:
    • Create a Checkout Extension: Develop a Checkout Extension (a JavaScript file) that will be injected into the Shopify checkout page.
    • Payment Form: Within the Checkout Extension, create an HTML form for customers to enter their payment information (e.g., card details, bank account information).
    • Payment Processing: Integrate your chosen payment gateway’s JavaScript SDK or API within the Checkout Extension to handle the payment request.
    • Confirmation Page: Upon successful payment, display a custom confirmation page within the Shopify checkout flow.

3. Core Functionality

  • Checkout Extension:
    • Communication: Establish a secure communication channel between your Checkout Extension and your server-side application.
    • Data Validation: Validate the entered payment information (e.g., card number, CVV, expiration date).
    • Payment Request: Send the payment request to your chosen payment gateway’s API.
    • Handle Responses: Handle successful and unsuccessful payment responses from the gateway.
    • Display Confirmation: If the payment is successful, display a custom confirmation message within the Shopify checkout

Hoping my solution helps you solve your problem.

Best regards,

Richard | PageFly

3

First of all, thank you for your guidance! I’m still a bit apprehensive about developing my custom payment plugin, as I’m unsure where to begin or how to approach it. Do you have any video guides or tutorials that can help me get started with this? Thanks again for the support and the advice you’ve already shared!