A Node.js app to integrate Payhere.lk payment gateway using Netlify Functions & Fauna DB.

• Payhere JavaScript SDK
• Payhere Test Cards

1. Clone the repo & run npm install to install the dependencies.
2. Setup the Fauna DB connection & create the collection & index.
3. Add Environment Variables to .env file.

To ensure the seamless functioning of the entire funnel, follow these steps:

• Execute both netlify dev and set up ngrok to examine the complete process. This is necessary as Payhere requires a public-facing URL for the notify_url.
• If the repository is already linked to a Netlify site, simply run netlify dev --live without the need for ngrok. You can use netlify link to connect the repository and the Netlify site efficiently.

• Create a Database in US Region Group.
• Go to the Database > Security > Create a secret key with the server role.
• Add the key to the .env file as FAUNA_SECRET_KEY
• Run below to create the collection payhere-demo-orders & index orders_by_order_id

  node faunadb/faunaSetup.js

• Generate .env file from .env.example and add your env variables.

  cp .env.example .env

• If new keys are added to the .env file, run below command to update the example file with new keys.

  sed 's/=.*/=/' .env > .env.example

1. Why Netlify Functions?

• 🔐 Security: The Payhere Merchant Secret is required for generating the hash. Performing this operation on the front-end poses security risks. Netlify Functions act as a secure backend for handling the hash generation process.
• 📡 Server Callback: Netlify Functions listen to payment notifications from PayHere, facilitating the passing of relevant information to the front-end.

2. Why Fauna DB?

• 🏦 Payment Status Handling: Since PayHere doesn't provide payment status parameters to the return_url during customer redirection, updating the database upon fetching payment status via your notify_url script is crucial.
• 🏢 Modern Database Solution: Fauna DB is a cloud-native database with a flexible document data model. It seamlessly integrates semi-structured data with powerful relational features, including foreign keys, views, and joins.
• 🔁 Efficient Data Retrieval: Integration with Fauna DB allows you to efficiently retrieve payment status & display to customers on the return_url page.