[ic] capturing payment upon shipping

[Dan Helfman]

I'm interested in adding to Interchange the ability to
capture/settle/postauthorize credit card payments only when an order is
changed to "Shipped" in the admin orders interface. I'm already
preauthorizing the payment as soon as the order is placed by using the
TrustCommerce payment module. What I want to know is what it would take
to implement this feature and whether anyone has any ideas on the best
way to go about doing it.

My idea is to ask the payment gateway for a transaction ID upon the
initial preauthorization and then store that in the Interchange order
database. Then, when the merchant goes into the admin orders interface
and changes the order to "Shipped", the payment gateway should be asked
to settle the particular transaction ID for that order.

The whole rationale in doing this is that Visa and other credit card
companies mandate that a merchant not charge a customer's card until the
product is shipped, which is (in part) why there is the separate
preauthorization/postauthorization process to begin with.

Comments?

-- 
Dan Helfman
Software Engineer, TrustCommerce
(626) 744-7700 x813
dan@trustcommerce.com
http://www.trustcommerce.com