GETList contacts/api/v1/contactsGETGet a contact/api/v1/contacts/{contactId}POSTAdd or update one contact/api/v1/lists/{listId}/contactsPOSTImport contacts in bulk/api/v1/lists/{listId}/contacts/bulkPATCHUpdate a contact/api/v1/contacts/{contactId}POSTUnsubscribe a contact/api/v1/contacts/{contactId}/unsubscribePOSTResubscribe a contact/api/v1/contacts/{contactId}/resubscribePOSTOpt a contact out of a topic/api/v1/contacts/{contactId}/topics/{topicId}/opt-outPOSTResubscribe a contact to a topic/api/v1/contacts/{contactId}/topics/{topicId}/resubscribe