List contacts

Every phone number your lines have exchanged a message or a call with, newest activity first. A contact is derived, not stored — there is no address book to add anyone to. Dial reads your message and call history and reports one row per counterparty, so a number appears here the moment it first texts or calls one of your lines, or one of your lines first reaches it, and never needs to be created or deleted. **Counts span every line on the account.** Two of your numbers talking to the same person is one contact with the totals added together, not two rows — the contact is the person, not the pairing. **Group conversations are not contacts.** A group message is addressed to the group rather than to a person, so it is counted under neither the group nor the participant who sent it. List groups is where those live. **Pagination** is Stripe-style and matches List billing activity: pass `limit` for the page size and `starting_after` set to the `lastAt` of the last contact you received to fetch the next page (only contacts whose activity is strictly older are returned). `hasMore` tells you whether to ask again. Most accounts get everything in one call.