This is the `amazonPayToken` that you obtained from the [Get Checkout Session](https://amazon-pay-acquirer-guide.s3-eu-west-1.amazonaws.com/v1/amazon-pay-api-v2/checkout-session.html#get-checkout-sess
checkoutAttemptId
string
The checkout attempt identifier.
checkoutSessionId
string
The `checkoutSessionId` is used to identify the checkout session at the Amazon Pay side. This field is required only for drop-in and components integration, where it replaces the amazonPayToken.