HTML <iframe> allowpaymentrequest Attribute

Note: This attribute is Experimental.

<iframe src="https://www.paypal.com/" allowpaymentrequest>
  Your browser does not support iframe element.
</iframe>

Meaning

The allowpaymentrequest set to true if a cross-origin <iframe> should be allowed to invoke the Payment Request API.

Note: This attribute is considered a legacy attribute and redefined as allow="payment".

<iframe allowpaymentrequest="allowpaymentrequest">

Value	Description
allowpaymentrequest	This is a boolean attribute, the presence of a boolean attribute on an element represents the true value, and the absence of the attribute represents the false value.