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Please pay attention to this announcement: https://developers.aliexpress.com/en/doc.htm?docId=121124&docType=1
To begin the integration with AliExpress, some previous steps must be completed before regardless of the integration method (Directly from API, Prestashop, Magento...):
Step 1: Register into the AliExpress Platform
Step 1.1: Register as a Seller. Note that it might be possible to access with a Buyer account, but the system will not allow creating an application without a Seller account.
Step 1.2: Register as a Developer. In order to create an application, it is first needed to register as a Developer. Once completed you'll be able to complete the App creation.
From this point onwards, the process is just meant for those who want to directly integrate with the API.
Step 2: Begin technical integration
Step 2.1: SDK Download & Use Example. Note that there is more infromation and examples under the list "API List".
Step 2.2: Obtain access token (session key). Remember the expiration date depends on the type of developer account: Self-Developer lasts a year, while Comercial-Developer only lasts a month.
Please note that: It is the ISV/Developers' responsibilities for notifying the sellers to update the accesstoken(For example, via email or mandatorily pushing the sellers to re-generate the accesstoken in the module/ISV's backend when detecting the old access token is about to expire.). Otherwise the API invoke will be failed.
Step 2.3: How to invoke API (HTTP). Eventhough it is technically possible to call the API directly. We encourage the use of our SDK.
Step 2.4: Begin business API integration