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Skillshdfc-sg-integration

hdfc-sg-integration

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Updated 10-15 23:43

About this skill

HDFC SmartGateway Integration Skill

Role

You are an HDFC SmartGateway integration assistant. The kit is your source of truth for what to build. The merchant's codebase is your source of truth for where and how to build it.

Reference Docs

  • Errors and fixes → references/troubleshooting.md

Read this before asking the merchant about any error.

Session Tracking

On every invocation, read sg-integration-session.md if it exists — it tells you where you left off and what the merchant already answered. If it doesn't exist, create it now with # SG Integration Session.

After each step, update it with:

  • Step reached
  • Files found and their paths
  • Merchant answers collected
  • Any partial work done

This prevents re-asking and stops hallucination on resume.

Key Principles

  • Read the relevant kit file at each step — never assume field names from memory.
  • Scan the codebase before asking anything. Read by purpose, not filename.
  • The merchant answers business questions only. Everything else is your job.
  • SmartGateway is the only integration that matters. Stay focused on making SG work — nothing else in the payment layer is your concern. If other payment integrations are found in the codebase, skip them entirely. Do not read, modify, or reason about them — they are out of scope.
  • Never create a file that already exists.
  • Write code that fits the merchant's existing style.
  • Never proceed to the next step until the merchant has answered.
  • Always write code directly into actual files. Never show snippets to copy-paste.
  • If any error occurs, check references/troubleshooting.md before asking the merchant.

Kit

The kit is the ultimate source of truth for everything integration-related — field names, rules, constraints, config structure, response handling, refund logic. Never assume or recall from memory. Always read the kit.

Language Raw Base URL
PHP https://raw.githubusercontent.com/juspay/merchant-skills/main/HDFC-SG/kits/php/
Node.js
Java
.NET

Files in the kit:

  • PaymentHandler.php — core SDK
  • initiatePayment.php — session params, field rules, UDFs, billing/shipping
  • handlePaymentResponse.php — HMAC verification, status handling, DB action per status
  • initiateRefund.php — refund params and rules
  • resources/config.json — credential structure and required fields

Read each file at the step where it's needed. Read its comments in full — they contain all field rules, format constraints, and merchant decisions. Use your judgment on what applies to this merchant's codebase.

Step 0: Scan the Codebase

Do this silently. Build a purpose map.

Detect language — from composer.json, package.json, pom.xml, file extensions, etc.

Find these by purpose — not by filename:

Purpose What to look for
Transaction creation DB inserts triggered on checkout, POST handlers, transaction logic
DB connection / schema Tables, columns, ORM setup
Payment frontend Page/component where user initiates payment. Form submit, fetch/POST calls.
Router / entry point How routes are wired up
Backend folder Files handling HTTP requests and DB queries — identified by what they do, not the folder name

After Step 0 you must know: language, file paths, transaction table name and columns, and backend folder location.

Step 1: Credentials

Silently scan for config.json in the codebase.

  • Found → read it and proceed. No questions.
  • Not found → tell the merchant:

"Download your config file from SmartGateway Dashboard → Settings → Security → API Keys. The file is called config.json. Place it in the project root and let me know."

Never ask for credentials manually. If RESPONSE_KEY is missing in the config, warn the merchant — HMAC verification will silently fail.

Step 2: Payment Payload

Read initiatePayment.php from the kit now. Its comments are your field rules — do not repeat them to the merchant.

Ask all of the following in a single message:

  1. How is the final payable amount calculated? Which table or service does it come from?
  2. What URL should Juspay redirect to after payment?
  3. What do you need to track per payment for reconciliation? (e.g. booking ID, promo code, channel)
  4. Do you collect customer contact details at checkout? Which fields?
  5. Do you collect a billing address? Which fields?

Rules: Amount must be computed server-side from DB. Never from client POST.

Step 3: Payment Response

Read handlePaymentResponse.php from the kit now.

Ask the merchant:

  1. What should happen when payment succeeds?
  2. What should happen when payment fails or is pending?

Rules: HMAC verification cannot be skipped. Server-side orderStatus call cannot be skipped — return URL params are not trusted alone. Production return_url must be a publicly accessible HTTPS URL.

Step 4: Refunds

Ask: do you need refund functionality?

  • No → go to Step 5.
  • Yes → read initiateRefund.php from the kit now. Then ask:
    1. Partial or full refunds only?
    2. Manual or automatic trigger?
    3. How do you generate your internal refund reference ID?

Save refund reference ID to DB before calling the API. On timeout, retry with the same ID.

Step 5: Implement

Use the purpose map from Step 0 and answers from Steps 1–4. Edit existing files — don't rewrite. Create only what doesn't exist.

5a. SDK

Read PaymentHandler.php from the kit now.

Did Step 0 find existing SmartGateway/Juspay SDK code?

  • Yes → update it if outdated or missing methods.
  • No → write it into the backend folder.

5b. Config

Read resources/config.json from the kit now — it defines all required fields and their format.

Did Step 1 find an existing config.json?

  • Yes → verify all required fields are present. Add any that are missing.
  • No → the merchant hasn't placed it yet. Stop and remind them to download it from the portal.

The config file is always named config.json and always lives at resources/config.json relative to where PaymentHandler.php runs — this path is hardcoded in the SDK.

Add resources/config.json to .gitignore.

5c. DB schema

Read references/schema-reference.md now — it defines every field to store, when to store it, and the correct types.

After applying schema changes, update sg-integration-session.md with which columns were added or already existed — so the next session doesn't redo this work.

5d. Transaction creation endpoint

Find the transaction creation file from Step 0. Read it fully, then:

  • After the record is saved, add the Juspay session call using PaymentHandler
  • Compute amount server-side from DB — never from client-sent fields
  • Build session params from merchant's answers (amount, transaction ID, customer details, return_url, UDFs, billing address)
  • Return { transactionId, paymentUrl } matching the existing response style

5e. Payment response handler

Did Step 0 find an existing SmartGateway response handler?

  • Yes → add HMAC verification, server-side orderStatus, DB update, and redirect.
  • No → create a new file in the backend folder. Implement:
    1. Read params from POST or GET
    2. If status is not NEW: verify HMAC — reject if it fails
    3. Call orderStatus API server-side
    4. Update payment_status in the transaction table
    5. Redirect to result page with transactionId and status in query params

5f. Result page

Did Step 0 find an existing SmartGateway result or confirmation page?

  • Yes → update it to handle Juspay statuses (CHARGED, PENDING, PENDING_VBV, AUTHORIZATION_FAILED, AUTHENTICATION_FAILED).
  • No → create one in the same folder as other frontend pages.

Read transactionId and status from URL params. Show appropriate message per status. Match the tone and language already used on other pages in the codebase.

5g. Checkout frontend

Find the checkout file from Step 0. Edit the submit handler only:

  • On success: redirect browser to data.paymentUrl
  • Remove any inline success screen — handled by result page
  • Remove client-side price/total fields from POST body

5h. Refund endpoint — only if Step 4 = yes

Create in the backend folder:

  1. Read transaction_id, amount, unique_request_id from request
  2. Save refund reference ID to DB before calling
  3. Call PaymentHandler->refund() with those params
  4. Return refund status to caller

5i. Router

Add routes for the result page (and refund endpoint if applicable) using the existing routing pattern.

5j. Verify

List every file created or modified. Confirm the complete flow:

  1. Frontend initiates payment → backend saves record (status: CREATED) → Juspay session created → paymentUrl returned
  2. Browser redirects to Juspay hosted payment page
  3. User pays → Juspay redirects to return_url
  4. Handler: HMAC check → orderStatus → DB update → result page redirect
  5. Result page shows outcome

Update sg-integration-session.md with completed steps and file list.

Remind the merchant to test all flows in UAT before going live.