Applying Coupons at Checkout

Customer Experience

When a customer is on the Inflow hosted checkout page:

1. They see a "Have a coupon?" or discount code field.
2. They enter the coupon code (e.g., SUMMER20).
3. The system validates the code in real time.
4. If valid, the discount is applied and the updated total is displayed.
5. The customer completes payment at the discounted price.

Behind the Scenes

The checkout page uses two API endpoints to handle coupons:

Step 1: Validate

POST /checkout/validate-coupon/{paymentId}
Body: { "code": "SUMMER20" }

This checks:

• Does the coupon code exist?
• Is the coupon still active (not expired)?
• Has the usage limit been reached?
• Is the coupon applicable to this payment?

If valid, it returns the discount details (type, value, resulting amount).

Step 2: Apply

POST /checkout/apply-coupon/{paymentId}
Body: { "code": "SUMMER20" }

This:

• Applies the discount to the payment
• Updates the payment amount
• Records the coupon usage

Discounts with Subscriptions

When a coupon is applied to a subscription checkout:

• The discount applies to the first payment (and possibly subsequent payments, depending on the coupon configuration).
• The subscription offer's regular price is not permanently changed.

Tax Calculation with Coupons

Tax is calculated on the discounted amount:

Tips

• Create clear, memorable coupon codes (e.g., WELCOME10, ANNUAL50).
• Set usage limits to control your discount budget.
• Use expiration dates for time-limited promotions.
• Monitor coupon usage from the Dashboard to track campaign performance.