Checkout Interface Overview

What Is the Hosted Checkout?

Inflow provides a secure, hosted checkout page where your customers complete their payments. You don't need to build your own payment form — Inflow handles the entire checkout experience.

The checkout page is used for:

• Payment links — When a customer clicks a payment link
• Subscription links — When a customer subscribes to an offer
• API-created payments — When you create a payment via the API and redirect the customer to the purchaseUrl

Checkout Flow

1. Customer arrives on the checkout page (via link or redirect).
2. Payment details are displayed: product name, price, currency, and tax (if applicable).
3. Customer selects a payment method: Local Bank Transfer, Card (Visa, Mastercard, Amex, Discover), Apple Pay, or Google Pay.
4. Customer completes payment: depending on the method, they authenticate via their bank or enter card details.
5. Confirmation: the customer is redirected to your successUrl or shown a confirmation page.

Available Payment Methods

The checkout automatically displays the payment methods available based on the customer's location:

Customization Options

You can customize the checkout appearance when creating a payment or link:

These options are available via the sessionCustomization object when creating payments, links, or subscription offers through the API.

Tax Handling

If applicable, tax (VAT) is automatically calculated based on the customer's billing country and displayed on the checkout page.

Hosted checkout payments always use TAX_EXCLUSIVE (tax added on top). To control pricing mode, use Server-to-Server Payments or Subscription Offers.

Redirect URLs

When creating a payment via POST /api/checkout/payment, you can specify:

• successUrl (required) — Where the customer is sent after a successful payment. The payment ID is appended as ?paymentId={id}.
• cancelUrl (required) — Where the customer is sent if they abandon the checkout. Can be null if you don't need a cancel page.
• expiresAt (optional) — Unix timestamp (in seconds) after which the checkout link expires. Must be a future timestamp. After expiry, the payment enters an EXPIRED display state.

Minimum Payment Amounts

Each currency has a minimum payment amount. Payments below these thresholds will be rejected:

Amounts are specified in cents when using the API. For example, €1.50 = 150 cents.

Security

• All checkout pages are served over HTTPS.
• Card data is tokenized via PCI-compliant iframe isolation (never touches your servers).
• 3D Secure (3DS) authentication is handled automatically when required.