Promo code exception lists overview

Promo code exception lists can be used to pay partners different rates based on promo codes associated with actions they drove.

Endpoints
POST	/Advertisers/:AccountSID/PromoCodeExceptionLists
GET	/Advertisers/:AccountSID/PromoCodeExceptionLists/:PromoCodeExceptionListId
PUT	/Advertisers/:AccountSID/PromoCodeExceptionLists/:PromoCodeExceptionListId
POST	/Advertisers/:AccountSID/PromoCodeExceptionLists/:PromoCodeExceptionListId/Items
GET	/Advertisers/:AccountSID/PromoCodeExceptionLists/:PromoCodeExceptionListId/Items/:ItemId
DELETE	/Advertisers/:AccountSID/PromoCodeExceptionLists/:PromoCodeExceptionListId/Items/:ItemId
DELETE	/Advertisers/:AccountSID/PromoCodeExceptionLists/:PromoCodeExceptionListId/Items
GET	/Advertisers/:AccountSID/PromoCodeExceptionLists/:PromoCodeExceptionListId/Items