Use cid-txid as invnum for pp payments
Add item data to create ec payment call
Merge pull request #721 from sharetribe/paypal-mandatory-params

Add mandatory params to PP API calls
added commission_from_seller column to transaction
copy 'current' commission_from_seller from community to transaction
hold_in_escrow fix. should not be a problem in production but helped in dev environment
refactoring: listing_conversation to listing_transaction
reduced the amount of globals in confirm.haml
initial calculate commission for seller
Redefine ref tx in and out params
Implement billing agreements / charge_commission
Extract with_success to a mixin
Automatic retries + fallback for charge_commission
added minimum commission to transaction
added minimum commission handling to transaction
refactored sellers accept_preauthorized_conversation view for paypal
refactored complete function in Transaction service
bug fixes
refactored total commission in receipt