Goals will tell Google Analytics when something important has happened on your website.
Go to Google Analytics menu bar and click Admin.
The window that will appear will show the settings like Account, Property, and View that you want to track. Click on Goals.
Click + NEW GOAL.
In Goal setup, select the Template check box, then select Make a Payment in the REVENUE section.
The Goal Description Name field is pre-filled, but you can enter a different name. Make sure that the Destination option is selected. Click Continue.
In the Goal details section, enter the URL. Leave the Case sensitive box unchecked unless you require it.
Click Verify this Goal to see if your Goal is set up correctly.