Fees on MKR and fees on ZRX orders used to pay the fees.
We're using AssetBuyer here for future proofing even though it makes an additional 2 requests for the order books. This will help when fees move from ZRX to another token rather than front end keeping a special cased list of ZRX orders.
When fees exist on the order we use AssetBuyer to buy via the Forwarder rather than the Forwarder directly.
Fixes #557 0xProject/0x-launch-kit#22
Example Tx
Fees on MKR and fees on ZRX orders used to pay the fees.
We're using AssetBuyer here for future proofing even though it makes an additional 2 requests for the order books. This will help when fees move from ZRX to another token rather than front end keeping a special cased list of ZRX orders.