We send an Access Request to your AdWords account. In order to accept the invitation, go to your Google AdWords account and first click on Account Access in the upper left corner of the screen. Second, click on Accept Request that appears on the screen under Client Managers--> Actions.
Lastly, Click on CHECK on the Ad-Pure screen. The 'Check' button will check if you have approved the invitation.This is the final step and after getting done with it, your account is finally connected with Ad-Pure.