trans_amount:: *
out_order_no:: * out_order_no
timestamp:: * timestamp(UTC)
notify_url:: * notify_url
return_url:: * return_url
description:: * description
merchant_no:: * merchant_no
app_id:: * app_id
signKey:: * signKey
extension_parameters:: {"background_colour":"FF00BB","logo_path":"https://developer.snappay.ca/images/in-store.jpg"}