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Check the Browser compatibility table carefully before using this in production.
The topLevelOrigin read-only property of the PaymentRequestEvent interface returns the top-level origin where the PaymentRequest object was initialized.
var aUsvString = paymentRequestEvent.topLevelOrigin
A USVString
| Specification | Status | Comment |
|---|---|---|
| Payment Handler API The definition of 'topLevelOrigin' in that specification. | Working Draft | Initial definition. |
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https://developer.mozilla.org/en-US/docs/Web/API/PaymentRequestEvent/topLevelOrigin