Making xml property public so we can access the SimpleXML object directly

[chrisnharvey]

If someone is using a custom template, such as Secure Trading's 3Dsecure implementation, then the data in the Response object is not enough to complete the payment process.

I have just changed the visibility of the $xml property to public so we can access the SimpleXML object directly to get the data we need.

[coveralls]

Coverage increased (+0.02%) to 97.71% when pulling a83b231 on chrisnharvey:patch-1 into ac20750 on gajus:master.

[coveralls]

Coverage increased (+0.02%) to 97.71% when pulling a83b231 on chrisnharvey:patch-1 into ac20750 on gajus:master.

[gajus]

I am not happy with exposing the entire SimpleXML object. (This creates a direct dependency between SecureTrading XML feed and library API) I would prefer an abstraction that would extract domain specific data/state. I have not worked with 3Dsecure, but if I will, I will add the missing functionality. Alternatively, contributions are welcome, of course.

[chrisnharvey]

That makes sense. Do you have any suggestions for a possible abstraction? I'm happy to implement.