Re: [w3c/payment-request] onpaymentchange event to validate payment details (#634)

Hi Marcos/Adrian,
I am from JCrew, our payment processes CyberSource validates name on the card (`BasicCardResponse.cardholderName`) and `BasicCardResponse.billingaddress`. 
Billing address validation is mainly to avoid fraud in case of lost card, so we send name on card and billing address too, they validate all the required fields including first & last name on billing address first then send request to Banks.

In this case some users are having one name only not having first & last name in billing address as your UI ask full name in one field, i saw 4-5 rejections from CyberSource saying bill address last name is required after we launched Payment Request API 2 days back .

I hope this information helps.
-Chinna

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