Feature/174160060 support to sandbox in m2

[jrudani]

Changes as requested in PR #52

[r-martins]

Thanks for the update @jrudani .
I can confirm the "Pagar no PagSeguro" (Redirect) is now working on the correct url.
I also found the following problems/errors:

1. In orders placed with the above method in Sandbox, the message "Ambiente de Testes" is not displayed in the block info in the admin.
2. When opening an order with _cc method, I got the error Notice: Undefined index: is_sandbox in /var/www/html/app/code/RicardoMartins/PagSeguro/view/adminhtml/templates/info/cc.phtml on line 6, and couldn't see the order. I guess the issue only happens to old transactions or those placed with sandbox mode turned off. Please check if the problem occurs in the frontend block too for the client that tries to see its order in the customer area.
3. The notification still doesn't work, and it's probably because the url you're using is incorrect. For example, when sending the notificationCode 93DC0FF3DD54DD54B885546EBF91BA8D74B4, the sandbox url you use is https://ws.sandbox.pagseguro.uol.com.br/v2/transactions/notifications/93DC0FF3DD54DD54B885546EBF91BA8D74B4?token=0&email=v47654530968559692463%40sandbox.pagseguro.com.br, which would return some error or Not found. The correct as we see in M1 would be https://ws.ricardomartins.net.br/pspro/v7/wspagseguro/v2/transactions/notifications/93DC0FF3DD54DD54B885546EBF91BA8D74B4?public_key=PUBC468779D3E884CD690ACB09FC42B5A0D&isSandbox=1 where Public key is the sandbox public key. Ideally (not mandatory atm) those URL's preffixes should be defined in config.xml (as in M1).

Thanks in advance. We are almost there.

[r-martins]

Remember to use new array syntax [] to reduce code quality issues.

[r-martins]

Hi @jrudani
I just reviewed it again. You've solved the other problem related to error when displaying older CC orders in the admin, but the other 2 issues remains untouched.

1. It still using the wrong url (as described in item 3 in my previous msg)
2. It still doesn't show the message about test environment in admin block for orders placed using rm_pagseguro_pagar_no_pagseguro method.