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Important: There is a new Amazon Pay Checkout version. Amazon Pay will continue to support this version but it will not be updated with new features. See release notes for changelog. Please consider migrating to the newer version for the latest checkout features if you are still using API Version 1. See Check API Version to find out what version you are using.

Use Sandbox simulations

Use Sandbox simulations to test your integration before going live. You can simulate different checkout scenarios such as payment declines and cart abandonment by selecting specific simulated payment methods during Sandbox checkout. You can also intentionally trigger different API responses by adding simulation strings to your request header.

Note: if you use both simulated payment methods and simulation strings during the same checkout, simulation strings will override any behavior triggered by using a simulated payment method.

Using simulated payment methods
Using simulation strings

Using simulated payment methods

Sandbox test buyer accounts come pre-configured with simulated payment methods. Select a payment method marked with * during Sandbox checkout to simulate a specific payment scenario. You will get an error if the simulation prerequisite has not been met.

Card number	Payment scenario	Prerequisite
...1111 ...0005 ...4444 ...9424 ...0000	Happy case. On the `checkoutResultReturnUrl` page you will get: Charge in Authorized state if `paymentIntent` was set to Authorize ChargePermission in Chargeable state if `paymentIntent` was set to Confirm	-
...3064	Checkout Session in Canceled state with BuyerCanceled reason code after the buyer returns to `checkoutResultReturnUrl`	-
...3434	Checkout Session in Canceled state with Declined reason code after the buyer returns to `checkoutResultReturnUrl`	-
...0701	Charge will be in AuthorizeInitiated state after the buyer returns to `checkoutResultReturnUrl`. It will move to Authorized state after 30 seconds based on `paymentIntent`	You must set `paymentIntent` to Authorize, and `canHandlePendingAuthorization` to true on the Checkout Session or using this payment method will result in an error
...4354	Charge will be in AuthorizeInitiated state, when `checkoutResultReturnUrl` is visited. It will move to Declined state after 30 seconds with reason code HardDeclined	You must set paymentIntent to Authorize, and `canHandlePendingAuthorization` to true on the Checkout Session or using this payment method will result in an error

Using simulation strings

Add x-amz-pay-simulation-code request header to your API calls to simulate different behaviors. For example, “x-amz-pay-simulation-code = ”BuyerCanceled”. Note that you should not include x-amz-pay-simulation-code request header in the header signature.

Checkout Session

State	Reason code	Simulation code	How to simulate
Open	-	-	Create Checkout Session
Completed	-	-	Redirect Buyer to `amazonPayRedirectUrl`
Canceled	Expired	-	Checkout Session will expire after 24 hours in Open state
Canceled	BuyerCanceled	BuyerCanceled	Specify the simulation code in the header of Get Checkout Session or Update Checkout Session and redirect the buyer to `amazonPayRedirectUrl` Note that simulation codes are not persisted. You must set the simulation code in the request, immediately preceding the redirect
Canceled	AmazonCanceled	AmazonCanceled	Specify the simulation code in the header of Get Checkout Session, or Update Checkout Session and redirect the buyer to `amazonPayRedirectUrl` Note that simulation codes are not persisted. You must set the simulation code in the request, immediately preceding the redirect
Canceled	Declined	Declined	Specify the simulation code in the header of Get Checkout Session or Update Checkout Session, and redirect the buyer to `amazonPayRedirectUrl` Note that simulation codes are not persisted. You must set the simulation code in the request immediately preceding the redirect

Charge

State	Reason code	Simulation code	How to simulate
AuthorizationInitiated	-	AuthorizationInitiated	Specify the simulation code in the header of Get Checkout Session, or Update Checkout Session with `canHandlePendingAuthorization` set to true. Redirect the buyer to `amazonPayRedirectUrl` Charge will be in the AuthorizationInitiated state for 30 seconds, and then move to Authorized or Captured state, based on PaymentIntent Note that simulation codes are not persisted. You must set the simulation code in the request, immediately preceding the redirect
Authorized	-	-	Update Checkout Session with `paymentIntent` set to Authorize. Redirect the buyer to `amazonPayRedirectUrl`
Authorized	-	AuthorizationInitiated	Specify the simulation code in the header of Get Checkout Session, or Update Checkout Session with `canHandlePendingAuthorization` set to true, and `paymentIntent` set to Authorize. Redirect the buyer to `amazonPayRedirectUrl` Charge will be in the AuthorizationInitiated state for 30 seconds, and then move to Authorized Note that simulation codes are not persisted. You must set the simulation code in the request, immediately preceding the redirect
Authorized	-	-	Create Charge with `canHandlePendingAuthorization` set to false, and `captureNow` set to false
Captured	-	-	Create Charge with `canHandlePendingAuthorization` set to false, and `captureNow` set to true
CaptureInitiated	-	CaptureInitiated	Specify the simulation code in the header of Capture Charge will be in CaptureInitiated state for 30 seconds, and then it will move to Captured state
Declined	SoftDeclined	PendingSoftDeclined	Specify the simulation code in the header of Get Checkout Session, Create Charge, or Update Checkout Session with `canHandlePendingAuthorization` set to true. Redirect the buyer to `amazonPayRedirectUrl` Charge will be in the AuthorizationInitiated state for 30 seconds, and then move to Declined state with reason code SoftDeclined Note that simulation codes are not persisted. You must set the simulation code in the request, immediately preceding the redirect
Declined	HardDeclined	PendingHardDeclined	Specify the simulation code in the header of Get Checkout Session, or Update Checkout Session with `canHandlePendingAuthorization` set to true. Redirect the buyer to `amazonPayRedirectUrl` Charge will be in the AuthorizationInitiated state for 30 seconds, and then move to Declined state with reason code HardDeclined Note that simulation codes are not persisted. You must set the simulation code in the request, immediately preceding the redirect
Declined	AmazonRejected	PendingAmazonRejected	Specify the simulation code in the header of Get Checkout Session, or Update Checkout Session with `canHandlePendingAuthorization` set to true. Redirect the buyer to `amazonPayRedirectUrl` Charge will be in the AuthorizationInitiated state for 30 seconds, and then move to Declined state with reason code AmazonRejected Note that simulation codes are not persisted. You must set the simulation code in the request, immediately preceding the redirect
Declined	AmazonRejected	AmazonRejected	Specify the simulation code in the header of Create Charge or Capture Charge will be in CaptureInitiated state for 30 seconds, and then it will move to Declined state
Declined	SoftDeclined	SoftDeclined	Specify the simulation code in the header of Create Charge
Declined	HardDeclined	HardDeclined	Specify the simulation code in the header of Create Charge
Declined	TransactionTimedOut	TransactionTimedOut	Specify the simulation code in the header of Create Charge
Canceled	MerchantCanceled	-	Cancel Charge

Charge Permission

State	Reason code	Simulation code	How to simulate
Chargeable	-	-	Complete checkout with a valid card
Closed	MerchantClosed	-	Cancel Charge Permission
Closed	AmazonClosed	AmazonClosed	Specify the simulation code in the header of Cancel Charge Permission. `CancelPendingCharges` must be set to false

Refund

State	Reason code	Simulation code	How to simulate
RefundInitiated	-	-	Create Refund. Refund will be in the RefundInitiated state for 30 seconds before moving to Refunded state
Refunded	-	-	Create Refund. Refund will be in the RefundInitiated state for 30 seconds before moving to Refunded state
Declined	AmazonRejected	AmazonRejected	Specify the simulation code in the header of Create Refund