Go2Pay - Transaction
--------------------
https://go2pay.uk/Services/Http/Transaction.ashx?Function=XXX&Format=...

FUNCTION: GET
- Format: JSON, XML, QueryString
- Account: Adelante Account ID
- User: Adelante User Name
- Password: Adelante Password
- MPOSID: Unique Transaction ID
- OrderReference: *OR* Order Reference
RETURNS
- Result: 'OK' or 'Error Message'

FUNCTION: GETDETAIL - returns additional user info
- Format: JSON, XML, QueryString
- Account: Adelante Account ID
- User: Adelante User Name
- Password: Adelante Password
- MPOSID: Unique Transaction ID
- OrderReference: *OR* Order Reference
RETURNS
- Result: 'OK' or 'Error Message'