Hi, 

I recently started a fulfilment company, and our recent client has asked if we can use their Odoo API to accept their orders for us to then process. They would also like us to upload the tracking number to their system via the API once dispatched.

We don't currently use Odoo. So what would be the best way to make this happen?

We need a method of receiving their orders and uploading their tracking numbers, without logging into their account. Possibly through other software, or by making an Odoo account and pairing them?

Help is greatly appreciated.