XRPL Wallet Integration + Shopify Checkout Plugin Goal Integrate an XRPL wallet library into an existing frontend and build a Shopify app that allows customers to pay with XRPL tokens (RLUSD or USDC) directly at checkout. When the buyer selects “Pay Now,” the app calls the backend to create a hosted XRPL payment link, opens it in a new tab, and enables payment through a compatible wallet (e.g., Xaman). Once the transaction is verified on-chain, the app automatically confirms the Shopify order. Source Code: Both the XRPL wallet library and the Shopify app source code will be made available. Timeline: Estimated project duration — 2.5 weeks. Reference Functionally similar to Helio’s Solana Pay app, but built for XRPL and an existing hosted payments backend. Core Flow 1. Merchant installs the plugin from the Shopify App Store. 2. App configuration: merchant provides their XRPL receiving address. 3. At checkout, the buyer selects “Pay with XRPL.” 4. The app requests a payment link with the parameters: amount, currency, order_id, return URLs). 5. A new tab opens to a hosted XRPL checkout page. 6. The buyer completes payment in RLUSD or USDC via a compatible XRPL wallet (e.g., Xaman). 7. A webhook from the backend verifies the on-chain transaction, updates the Shopify order to “Paid”, and records the transaction hash in the order notes. 8. The RLUSD or USDC is sent to the receiving XRPL address. Scope - XRPL Wallet Library Integration (into an existing UI) - Shopify App Development (installable, public plugin) - Secure Merchant Settings (API key + XRPL address) - Payment-Link API Integration (calls to an existing backend) - Webhook Endpoint for payment confirmation and order updates - Error Handling, Retries, and Idempotency using order_id Must Support - Currencies: RLUSD and USDC on XRPL - Wallets: Xaman (XUMM) deep-link / QR; generic XRPL address + memo flow - Order Reconciliation: Store transaction hash, amount, currency, and confirmation details - Security: PCI-safe flow (no card data, only redirects + webhooks) - Compliance: App Store readiness (OAuth, GDPR/uninstall cleanup, billing-free if applicable) Deliverables - Installed and integrated XRPL wallet library ( - Public Shopify app, ready for submission (with listing assets and privacy policy) - ENV-based configuration for API base URL and keys - Automated tests for webhook verification and order status updates - Minimal documentation: install → configure → test → go-live Tech Stack - Shopify App: Node.js / TypeScript using Remix or Next.js (App Bridge, Polaris, Checkout UI Extension) - Backend: Node.js / TypeScript (Express or Cloudflare Worker), webhook verification, HMAC signing - XRPL Integration: handled by the hosted checkout; app orchestrates redirects and webhooks only Acceptance Criteria Install app, configure XRPL address, place a test order, pay via hosted checkout, and see: - XRPL wallet receive and send assets - Shopify order auto-marked as “Paid” - Transaction hash recorded in the order timeline or notes - Cancelled/expired payments handled gracefully without marking as paid - Fully compatible with Shopify’s latest checkout extensibility