Getting Started with Implementing Checkout

Getting Started with Coinflow Checkout Integration

Merchants implementing checkout / pay-ins should determine which payment methods you want to support, settlement location, how you will identify the payers.

Implementation Paths

Choose the integration method that best fits your use case:

Checkout Link

The fastest way to get started. Generate a hosted checkout URL and redirect your users - no frontend code required.

Best for:

• Quick integrations
• Simple payment flows
• Minimal development resources

View Checkout Link Guide

React SDK

Embed Coinflow’s pre-built UI components directly in your React application for a seamless user experience.

Best for:

• React applications
• Custom branded experiences
• Embedded payment flows

View SDK Documentation

API Integration

Full control over the payment experience with direct API access. Build completely custom UIs while leveraging Coinflow’s infrastructure.

Best for:

• Custom payment UIs
• Mobile applications
• Advanced integrations

View API Reference

Payment Methods

Credit Cards, Debit Cards, Apple Pay, Google Pay Payments

Coinflow supports various payment methods, including credit cards, debit cards, Apple Pay, Google Pay, Wires, Bank Transfers. These payment methods are eligible for fraud protection coverage, including chargeback protection and 3D Secure (3DS). Coinflow recommends first testing payments without fraud protection tools enabled, then upon successful testing, test payments with chargeback protection and 3DS enabled.

For merchants enabling chargeback protection, ensure you:

• Add the chargeback protection script to every page of your site (not just the payment page).
• Pass chargeback protection parameters (e.g., chargebackProtectionData) to Coinflow.

Testing 3DS

To enable 3D Secure (3DS) for credit card transactions, merchants must pass the authentication3DS parameters when processing payments. If a friction challenge is required (e.g., a user must complete payment authentication), merchants must implement a 3DS challenge modal in their UI.

Note: If you’re using Coinflow’s checkout link or SDKs, no additional implementation is needed—our pre-built UI handles 3DS challenges automatically.

For testing 3DS functionality in the sandbox environment, be sure to use 3DS-enabled test card numbers.

ACH Payments

If you’re implementing ACH payments, you’ll need a bank authentication provider to allow payers to securely link their bank accounts. If you don’t have an existing bank authentication provider, you can use Coinflow’s UI for this process. Bank authentication is already included if you are implementing using Coinflow’s SDKs or Checkout link.

Advanced: Stablecoin Pay-Ins

To enable stablecoin pay-ins, contact the Coinflow team. Stablecoin pay-ins are available through Coinflow’s SDKs or Checkout link only. Stablecoin pay-ins are not supported via the API.

Settlement Locations

To begin integrating checkout with Coinflow, all merchants must first configure their settlement settings. This step is essential, as it ensures merchants can receive payments for successful transactions. Without configuring settlement settings, payment statuses will not reach the settled status, and Coinflow won’t be able to transfer funds for final settlement. Merchants must specify the settlementType when sending requests to Coinflow checkout. The correct settlement type depends on the location where the funds will be settled.

Coinflow settles funds to your bank account or to a Coinflow Wallet:

1. Coinflow Wallet (managed, default)
2. Your bank account

Advanced: On-Chain Settlement

• Merchant-Managed Wallet
• Settle to a Contract on the Configured Chain

Identifying Payers

Creating Session Keys

Most integrations identify payers by your existing customer ID. Pass any consistent string you already use in your system to create a session key.

Important: Session keys are valid for 24 hours. It’s the merchant’s responsibility to refresh the session key after it expires.

Advanced: Identifying Payers by Wallet Address

If your payers already have a wallet, you can use the wallet address to uniquely identify the payer when interacting with Coinflow. Set the x-coinflow-auth-blockchain header to the chain your payers are on.

curl --request GET \
     --url https://api-sandbox.coinflow.cash/api/auth/session-key \
     --header 'Authorization: YOUR_API_KEY' \
     --header 'accept: application/json' \
     --header 'x-coinflow-auth-blockchain: <chain>' \
     --header 'x-coinflow-auth-wallet: PAYERS_WALLET_ADDRESS'