[SOLVED] - Error Retry: BadRequest - API application "nnnnnn" invalid.
In the Easify ECommerce Channel Manager you get the error: Retry: BadRequest - API application "nnnnnn" invalid where nnnnnn is a random number, this usually means that your API Token is incorrect,or you have configured the eBay Channel to use the wrong URL in the eBay Channel settings of the Easify ECommerce Channel Manager in Easify Pro.
First go to the ECommerce Channel Manager and view the eBay channel settings. On the eBay Settings tab make sure the eBay Server URL and eBay Picture Server URL are set to the correct values, e.g. if you are using a sandbox API Token make sure the sandbox URL is being used (click the yellow crash test dummy button to the right of the eBay Server URL Textbox). Or if you are using a live API Token make sure you are using the live eBay server URL (click the yellow lightning flash button to the right of the eBay Server URL Textbox).
If this fails, make sure your eBay API Token is still valid and has not expired.
Regards - Richard (Easify Developer)