Support array on params
add :shipping_email
Include shipping email on post params
remove gross_amount
add post_data.rb
Add backward compatibility for upcase parameters
Change commodity_price > commodity_unit, commodity_qty > commodity_num
Add promo bins
Change vespa to new_api
Update version
installment
Add points
Change points and point
add installment_bank & point_bank
Change to point banks
Update installment_nank to installment_banks
Add installment terms variable
Add installment terms variable
Remove points, installment flag
Set server host