M2E Pro extension must be granted with MWS tokens to be able to interact with eBay. The user token represents an authorization for application to access eBay data on behalf of an eBay User.
The Extension allows granting and using an unlimited number of MWS tokens for eBay accounts.
Adding an eBay Account
If you need to add another account, please do the following:
- go to eBay > Configuration > Accounts
- click Add Account
Or use the Add Another button at the first step of the new listing creation: