API ReferenceCheckout

Cash App Checkout

Initiates the checkout for a Cash App Payment

Authentication

x-coinflow-auth-session-keystring

The session key generated for the end user - see https://docs.coinflow.cash/api-reference/api-reference/authentication/get-session-key

OR
x-coinflow-auth-walletstring

The web3 wallet of the end user - see https://docs.coinflow.cash/api-reference/api-reference/authentication/get-session-key

x-coinflow-auth-blockchainstring

The blockchain associated with the end user - see https://docs.coinflow.cash/api-reference/api-reference/authentication/get-session-key

OR
x-coinflow-auth-user-idstring

The external identifier of the end user - see https://docs.coinflow.cash/api-reference/api-reference/authentication/get-session-key

Path parameters

merchantIdstringRequired

Headers

x-device-idstringOptional
- (Optional) If you are using Coinflow Chargeback Protection, you must pass the device id of the customer's device.
x-coinflow-client-ipstringOptional

Request

This endpoint expects an object.
subtotalobjectRequired
fixedFeeobjectOptional
customerInfoobjectOptional
webhookInfoobjectOptional
feePercentagedoubleOptional0-100

If this purchase is for a seller/submerchant where the marketplace takes a fee, this is the % fee which is taken from the subtotal amount.

jwtTokenstringOptional
This is a token encoding the parameters for the request. Allows purchase parameters to be verified to prevent manipulation when the checkout page is presented to the user.
rentobjectOptional

(Solana only) if your transaction requires a known amount of Rent to be paid, you can pass it here.

transactionDataobjectOptional

(EVM only) if you want to execute an EVM transaction on a successful purchase, you can pass a transaction request here.

Gas fees for the transaction will be automatically calculated and added to the total charged to the customer. Optionally the merchant can opt to pay for these gas fees.

stellarTransactionstringOptional
(Stellar only) Base64 XDR transaction string for executing a merchant contract call on a successful purchase. For transaction purchases, pass the base64 XDR string created using `.toXDR()` on a transaction built with generated TypeScript bindings (e.g., `NftClientWrapper.buildNftPurchaseTx`). For direct USDC transfers (no merchant transaction), omit this field or pass undefined. Gas fees for the transaction will be automatically calculated and added to the total charged to the customer.
settlementTypeenumOptional
Allowed values:
destinationAuthKeystringOptional
If utilizing USDC settlement to addresses other than your main merchant settlement address. Utilize this destinationAuthKey which is a JWT encoded with the information for which address to send the USDC to.
emailstringOptional

Response

Ok
expiresAtdatetime
paymentIdstring

Errors

412
Precondition Failed Error
423
Locked Error
451
Unavailable for Legal Reasons Error