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Integrations · Reference

API Parameters Reference

The keys you send and receive — contacts, action plans, history notes, sales cycles, events, email and text — with their formats and limits.

New · Updated Sep 21, 2026 · 6 min read
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1How parameters work

Parameters are key:value pairs — in the query string for a GET, in the body for a POST. Which ones a request requires is listed with the request in API Endpoint Reference; what follows is what the keys mean and what they’ll accept.

2Contact parameters

KeyMeaning and limits
client_idClientTether’s id for the contact. Required by some calls.
firstName, lastNameRequired for create_client. String.
phone, second_phoneTen digits, no formatting. phone is treated as the mobile.
smsok1 if it’s okay to text, 0 if not. Defaults to 1 when omitted.
emailWell-formed, and unique per contact.
address, cityString.
stateUS state or Canadian province, 2-letter abbreviation only.
zipUS and Canadian formats: 5, 5-4, 5-4-2 digits, or A1A 1A1 with a space after the third character.
compName, job_titleString.
tagComma-separated list. Tags that don’t exist are created.
external_idYour system’s id for the contact, for integration. Integer.
third_party_name + third_party_idAn alternative to external_id when several systems integrate.
deal_size, deal_closedWhole number; and the closed flag.

3Action plan parameters

KeyMeaning
action_plan_typeConnection, Conversion or Retention.
action_plan_link_idWhat the plan is linked to: for a Connection Plan, a lead source (so a new lead with that source starts this plan — a source should be linked to only one plan); for a Conversion Plan, a sales cycle (so starting the plan also moves the contact to that step).
action_plan_link_nameThe link’s name. Read only.
action_plan_next_plan_id / _nameThe plan that follows this one.

4History note parameters

KeyMeaning
typesms_in, sms_out, email_in, email_out or note. Anything else is stored as a note.
utc_datetimeyyyy-mm-ddT00:00:00Z — UTC.
subject, body_contentText.
user_nameMust match a user’s first and last name as set in Users. Up to 120 characters.

5Sales cycle parameters

KeyMeaning
sales_cycle_name, sales_cycle_orderName and position in the sequence.
sales_cycle_active_status1 for an active path, 0 for inactive.
sales_cycle_contact_type1 Client (default), 2 Employee, 3 Partner, 4 Vendor, 5 Other.

6Event parameters

KeyMeaning
event_typeCall, Contact Reminder or Appointment.
event_date, event_timeYYYY-MM-DD and HH:MM:SS.
event_end_date, event_end_timeAppointments only — both required.
user_idWhose calendar the event goes on.
event_manual_action_plan_idAn Event Plan to attach — only plans set to manual schedule.
email_listComma-separated addresses to invite.
template_idControls the title used on external calendars; without it a fixed title is used.
event_noteString.

7Email and text parameters

KeyMeaning
email_subjectRequired.
email_date, email_timeDefault to today and now when omitted.
email_bodyPlain text with hard returns — no HTML. Add your own signature; opt-out wording is appended for you.
email_cc, email_bccComma-separated addresses.
exclude_contact1 to leave the contact off the message; 0 or blank includes them.