A contact list is a reusable set of numbers, with the values of their variables, such as the customer name or the due balance. Keep your contact lists up to date from your own systems, and copy their numbers to new campaigns whenever you need them, instead of uploading the same numbers again and again.
See Contact Lists in the user guide for more details.
Endpoints
/contactLists/contactLists/{contactListId}/contactLists/contactLists/{contactListId}/contactLists/{contactListId}/contactLists/contactLists/{contactListId}/numbers/contactLists/{contactListId}/numbers/{numberId}/contactLists/{contactListId}/numbers/contactLists/{contactListId}/numbers/upload/contactLists/{contactListId}/numbers/download/contactLists/{contactListId}/numbers/{numberId}/contactLists/{contactListId}/numbers