Looks like you are tryning to visualize event in this way: session.onpaymentauthorized = function (event) { console.log(JSON.stringify(event)) } this would shows only {"isTrusted":true} you can't stringify event: https://stackoverflow.com/questions/11547672/how-to-stringify-event-object try visualize payment responce from envent directly: console.log(JSON.stringify(event.payment))