InventoryAPI by Erply is a powerful backend for web shops, and more.
This is a list of all customer related API functions. Click on function name and you'll find all required and optional input parameters and response fields.
verifyCustomerUserto validate the user name and password and retrieve the customer record that these credentials belong to. Calling this function will not create any "session" or make the customer somehow logged into API; it just serves a verification purpose.