[Vuejs]-Amazon payment integeration in Laravel and Vue.js

Make sure that prior to sending a request to complete checkout session that 1/the buyer has been redirected to checkoutResultReturnUrl (returned in response to update checkout session) and 2/ there are no constraints in the constraint object returned from update checkout session. If both of these conditions have been satisfied, know that complete checkout session must be requested within 24 hours of a buyer’s redirect to checkoutResultReturnUrl or the checkout session will automatically cancelled.