We eventually want to move all of the DonationInterface business logic into SmashPig, but we need to be able to use the new API before that's done.
Let's focus on building the SmashPig functionality from the bottom up, replacing just the curl_transaction function if possible.
The existing GlobalCollect adapter has some logic that we can re-use for a first draft.
- all of the configuration except var_map
- data staging should be the same
- processResponse deals with error codes which are identical across gateways
- The confirm_creditcard function is huge and gross, but it's got some subtleties that might be a pain to recreate.
I'd like to start by subclassing that and replacing only the functions that deal with the curl request and parsing XML.
curl_transaction will ignore the argument and instead use objects from SmashPig to call the new API
Early attempt at creating the Ingenico shell here: https://gerrit.wikimedia.org/r/364143
