Per https://w3ctag.github.io/design-principles/#casing-rules it should be "paymentRequestId" (lowercase).
I assume this is too late to change now, unless paymentRequestID/d is one of the things that are in the spec but nobody has shipped yet? If it is indeed too late, we should add a note to the spec saying essentially "sorry for creating an API inconsistent with the rest of the platform".
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https://github.com/w3c/browser-payment-api/issues/414