Required field for shipment purchase missing for Canada Post

[cknoxrun]

Sorry for submitting so many issues in a row like this, but I seem to be hitting one after another as I try to get return shipments working.

As I can't use return shipments using Canada Post (see #24), I was just going to purchase a label directly with the appropriate to and from addresses. However, I get the following response:

EasyPost::Error: (Status 400) Contract Number is a required field.
from /Users/knox/omx/kbase/vendor/ruby/2.2.0/gems/easypost-2.1.0/lib/easypost.rb:125:in `rescue in rescue in request'

The code looks like this:

from_address = EasyPost::Address.create(
  name:    order.name,
  street1: order.street1,
  street2: order.street2,
  city:    order.city,
  state:   order.province_state,
  zip:     order.postal_zip,
  country: order.country,
  email:   order.email,
  phone:   order.phone
)

return_address = EasyPost::Address.create(
  company: 'The Canadian BioSample Repository',
  street1: 'The University of Alberta',
  street2: 'Blah',
  city:    'Edmonton',
  state:   'AB',
  zip:     '...',
  country: 'Canada',
  email:   '...',
  phone:   '...'
)

shipment = EasyPost::Shipment.create(
  to_address:   return_address,
  from_address: from_address,
  parcel:       parcel
)

shipment.buy(rate: shipment.lowest_rate)

I've tried filling in invoice_number and tried add "contract_number" with an arbitrary number in case that would work around the issue but no dice.

Thanks a lot!
Craig

[cknoxrun]

This looks like it's a general issue with CanadaPost-EasyPost integration, I've emailed support so I'm going to close this issue as it isn't specific to the Ruby integration.