What to check before adding crypto checkout to a merchant app

#payments

Affiliation note: I work with MakePay, so the MakePay example below is affiliated. This article was prepared with AI assistance and reviewed before posting.

Disclosure: I work with MakePay, so the MakePay example below is affiliated.

Crypto checkout sounds simple until you map the merchant workflow end to end. The hard part is usually not showing a QR code. The hard part is deciding what happens before checkout, during payment confirmation, and after settlement.

Here is a practical checklist I use when reviewing a crypto checkout flow for a merchant application.

1. Decide what the merchant should receive

A customer may want to pay with BTC, ETH, SOL, USDT, USDC, or another asset. The merchant may only want to receive one settlement asset. If that choice is not explicit, reconciliation gets messy later.

Before implementation, define:

the accepted customer assets and networks
the merchant settlement asset
who pays the network or swap fee
what exchange-rate window is shown to the customer
what happens when a payment is late, partial, or overpaid

2. Keep custody assumptions visible

Some checkout providers custody funds before payout. Others route funds directly to a merchant wallet. Neither model should be hidden from the merchant.

For a self-custody flow, the merchant also needs a clear operational process: wallet ownership, backup, access control, and transaction review. For a custodial flow, the merchant needs payout timing, account-risk, and withdrawal rules.

3. Treat the payment record as part of the product

A payment screen is not enough. Merchants need a record that support, fulfillment, and accounting teams can understand.

At minimum, store:

order or invoice ID
expected amount and asset
received amount and asset
customer-facing checkout status
transaction hash or provider reference
settlement wallet and settlement asset
refund or exception state

4. Design for exceptions before launch

Crypto checkout exceptions are not rare edge cases. They are part of the normal support path.

Plan for:

expired checkout sessions
underpayments and overpayments
payments sent on the wrong network
delayed confirmation
customer refund requests
risk review before fulfillment

5. Use a small integration first

Start with the lowest-risk integration path. A hosted payment link or embedded checkout is usually easier to validate than a fully custom API flow. Once support and reconciliation are working, move deeper into custom API and webhook logic.

As one affiliated example, MakePay provides hosted payment links, embedded checkout, API/SDK options, and direct wallet settlement for merchants that want a non-custodial crypto payment flow: https://www.makepay.io/en

The broader point is provider-agnostic: pick the integration shape that matches your operational maturity. If your team cannot yet support payment exceptions, do not start with the most custom flow.

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