PaymentExpress: correct endpoints

[steveh]

Now that Payment Express has renamed to Windcave, the old endpoints no longer work.

Test Summary
Local: 5543 tests, 77553 assertions, 0 failures, 0 errors, 0 pendings, 0 omissions, 0 notifications 100% passed
Unit: 37 tests, 263 assertions, 0 failures, 0 errors, 0 pendings, 0 omissions, 0 notifications 100% passed
Remote: 17 tests, 79 assertions, 0 failures, 0 errors, 0 pendings, 0 omissions, 0 notifications 100% passed

[aenand]

@steveh do you have more context on the old endpoints not working? I do know of some merchants still using the old endpoints successfully.

[steveh]

@aenand I should have been more specific, only UAT is not working so far. We run integration tests on build against the UAT endpoint. On around the 4th of July it was removed:

$ nslookup uat.paymentexpress.com

** server can't find uat.paymentexpress.com: NXDOMAIN

Shown in history too: https://dnshistory.org/historical-dns-records/a/uat.paymentexpress.com

[aenand]

Ah I see, do you know when the production url will change? This PR alters both the UAT and production environment.

[steveh]

I don't know when the old production URL will stop working, I haven't seen any notices from Windcave.

The new URL is what's currently advertised: https://www.windcave.com/developer-ecommerce-pxpost

[aenand]

I don't know when the old production URL will stop working, I haven't seen any notices from Windcave.

The new URL is what's currently advertised: https://www.windcave.com/developer-ecommerce-pxpost

@steveh I've reached out to Windcave to confirm the prod urls have changed. Once they respond I can approve this PR!

[aenand]

@steveh Windcave has confirmed that merchants should move to the new URL! Could you please add a CHANGELOG entry?

[steveh]

@aenand Rebased and added changelog

[aenand]

@steveh ahhh someone merged an update to the CHANGELOG. If you can update it to resolve the merge conflict I will merge this first thing tomorrow morning!

[steveh]

@aenand Rebased again