The Email should be an API user in the EasyEcom account. Please follow the UserRole article for further steps. Password will be the EasyEcom password for the above user's Email.
Location_key will be the seller token of the warehouse where the WMS is required to be integrated.
Required Settings for this feature to work :
Settings accessible from UI
You are required to enable the Set Auto Dimensions setting at all locations for allowing the order processing
Account Settings>> Other settings>>Set Auto Dimensions for Multi Item Orders

- The EasyEcom Store locations should be enabled with the below setting to ensure proper Inventory sync.
Account Settings>> Other settings>> Set "Method to update inventory in Manage inventory page" as "Update available quantity only"
