Swap cybersource for stripe

[pdpinch]

Peter needs to get the credentials from David (works for Erdin)

don't forget about google analytics

Fulfillment is complex. We need to set up a post back.

• [ ] add status field to order model
• [ ] add an order id to the cybersource form
• [ ] create an end-point for cybersource to post back to (including order id)
  • [ ] validate the order id that's posted back, includes validating the price
• [ ] create the CCX, asynchronously
• [ ] notify the user when the CCX has been created
• [ ] update the status of the order

[pdpinch]

We got test credentials from David (Innovation team) but we don't have production credentials yet.