Development Standards
Third-Party

Third-Party Implementation Checklists

Run these checklists when integrating a payment gateway or email service. Each checklist maps directly to the corresponding standard.

Back to Checklists
Stripe

stripe-integration.html

Adding any Stripe payment flow

 Razorpay

razorpay-integration.html

Adding any Razorpay payment flow

 SendGrid

sendgrid-integration.html

Setting up SendGrid for transactional or marketing email

 Gmail

gmail-integration.html

Using Gmail SMTP for dev/internal tools

Related Standards

Third-Party Standards

Main third-party implementation standards page

Backend-First Logic

Use backend as the enforcement layer for payment and email workflows
Integration Rule

Never expose private API keys in frontend code. Payment, email, webhook, and provider-secret logic must stay server-side.