Re: [w3c/payment-request] Pay method for testing environment (#613)

@sabrinatseng I just discovered that too by accident: 
https://docs.microsoft.com/en-us/microsoft-edge/dev-guide/device/payment-request-api

@rsolomakhin ^^^ "Test Mode in Microsoft Edge"... 

```JS 
var supportedInstruments = [{
    supportedMethods: ['basic-card'],
    data: {
        supportedNetworks: ['visa', 'mastercard', 'amex'],
        supportedTypes: ['credit'] 
        //for test transactions uncomment the test flag below
        //environment: 'TEST'
    }         
}]; 
```

It doesn't exactly allow us to automate things, but it's something. 

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