Mobile as Identity for `Click to Pay` {#ctp-cc-mobile-identity}
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`Click to Pay` supports mobile numbers as way to identify a user. This enables cardholders to use their mobile number instead of their email address in certain markets for Visa and Mastercard transactions.  
When the requestEmail field is set to `false` and the requestPhone field is set to `true`, the cardholder is identified using the provided mobile number. When the requestEmail field is set to `true` and the requestPhone field is set to `false`, the cardholder is identified using the provided email address. When the requestEmail field is set to `true` and the requestPhone field is also set to `true`, the cardholder is identified using the provided email address first and then the mobile number if there is no match.