To connect amazon with OA, first you have to add 'Amazon source'. To do that, you have to go to the PRO Interface of OA.
1.
2. Go to Menu - Integrations - Sources ->Add source
3. From the possible sources, choose 'Amazon' and click 'Next'
4. Choose a name for the integration
5. And Activate
6. After activating, you will be redirected to Amazon to sign in
7. Authorize Orderadmin by checking the box on the bottom and press 'Confirm'
Selling Partner API Developer Guide
