payerPhone attribute

Click on each button in sequence from top to bottom without refreshing the page. Each button will bring up the Payment Request UI window.

When prompted, please use +12345678910 as the phone number.

1. payerPhone attribute is null when options is undefined.
2. payerPhone attribute is null when requestPayerPhone is undefined.
3. payerPhone attribute is null when requestPayerPhone is false.
4. payerPhone attribute is '+12345678910' when requestPayerPhone is true.
5. payerPhone attribute is '+12345678910' when requestPayerPhone is truthy.