For API authentication Public and Private keys are required.
Each user has his own unique keys. 
To generate and assign keys to user:
	- Login to Admin Area 
 
	- Click User tab
 
	- Click the Options icon under Actions to display the dropdown list, and then click Details
 
	- Click API Settings, it will open for with API Settings
 
	- Check API Access to allow user API requests or uncheck to disalow
 
	- Click Generate API Keys if you assign keys in first time or Reset API Keys if updating 
 
Important: if you reset API keys it will affect all current scripts for this user