Fix for issue #4

[xanadu-3g]

Hi! I've tried to fix issue #4, I might have broke some other functions, with replacing $this->SCA in the last line. I'm not aware why you were using the URL returned in the json instead of the original URL.

PS: Thanks for the class.

[robclark56]

Thanks for the proposed changes.

Can you expand on this: " might have broke some other functions"

Can you please run this: https://github.com/robclark56/TransferWise_PHP_SimpleAPIclass/blob/master/code/test.php

... with your changes

and confirm all works.

Thanks

Rob