generated: '2026-08-13'
method: searched
source: https://developer.constantcontact.com/api_guide/index.html
provider: Constant Contact
providerId: constant-contact
description: >-
  Constant Contact publishes dated V3 API release notes as the landing page of its API guide
  (developer.constantcontact.com/api_guide/index.html — the page title is "Release Notes").
  Entries are month-granular prose, not semantic versions, and there is no feed.
scheme: dated-prose
machine_readable: false
feed: null
current_version: v3 (contract build 3.0.149 in the harvested Swagger; 3.0.161 in the July 2026 SDK cut)
url: https://developer.constantcontact.com/api_guide/index.html
window: 2024-11 through 2026-04 (most recent entries at time of harvest)
entries:
- date: '2026-04'
  breaking: false
  additions:
  - New Social endpoints — Get Social Profiles, Get Social Network Connections, Get Hashtag
    Groups, Create Social Media Post.
  note: >-
    Confirmed live: /social/profiles, /social/connections, /social/hashtags/groups and
    /social/posts are all present in the current published Swagger (build 3.0.178, re-harvested
    2026-08-13). They arrived alongside an undocumented Automations tag
    (/automations/workflows) and a ten-path Billing surface.
- date: '2026-03'
  breaking: false
  additions:
  - New Events endpoints — Create Event, Update Event, Copy Event, Check In Tickets, Undo
    Check-In Tickets, Update Registration Status, Update Payment Status.
  note: >-
    These DID land in the contract — addDefaultEvent, patchEvent, copyEvent, checkInTickets,
    undoCheckInTickets, updateRegistrationStatusUsingPUT and
    updateRegistrationPaymentStatusUsingPUT are all present in
    openapi/constant-contact-events-api-openapi.yml.
- date: '2026-02'
  breaking: false
  additions:
  - 'Partner unsubscribe endpoint: POST /partner/accounts/{encoded_account_id}/contacts/unsubscribe.'
  note: Present in the contract as operationId partnerUnsubscribeContacts.
- date: '2025-12'
  breaking: false
  additions:
  - Four new Events endpoints for retrieving event and registration details.
- date: '2025-09'
  breaking: true
  additions:
  - Optional prompt=login parameter on the authorization endpoint to force re-authentication.
  - Custom Fields expanded with datetime, currency, text_area, number, boolean, single_select
    and multi_select data types plus richer metadata.
  - New Quick Start Guides for Contacts and Email Campaigns.
  - New open-source SDKs for PHP and C#.
  breaking_changes:
  - 'Partner authorization URL changed to https://authz.constantcontact.com/partners/oauth2/default/v1/token.'
- date: '2025-05'
  breaking: false
  additions:
  - SMS-only contacts — contacts can be created and managed without an email address.
  - V3 API Reference Tester redesigned.
- date: '2025-02'
  breaking: false
  additions:
  - Import and export of SMS data for contacts.
- date: '2024-11'
  breaking: false
  additions:
  - SMS Reports endpoint for campaign summaries (getAllBulkSmsCampaignSummaries).
notes:
- >-
  Release notes are HTML prose on a static S3-hosted page with no RSS/Atom feed, no JSON, and
  no per-entry anchors — an agent cannot subscribe to API change, only re-scrape.
- >-
  The release notes UNDER-report what shipped. The 2026-08-13 re-harvest of
  https://api.cc.email/v3/swagger.yaml moved the contract from build 3.0.149 (86 paths, 120
  operations) to 3.0.178 (100 paths, 128 operations). Fourteen new paths appeared, none removed.
  The Social four are announced in the release notes; the Automations workflows surface
  (/automations/workflows, /automations/workflows/{automation_flow_id}, a new Automations tag)
  and the entire ten-path Billing surface (/billing/plan, /billing/transactions,
  /billing/next-payment, /billing/add-ons, /billing/branding/logo, /billing/statement/email,
  /billing/prepayment-invoice/email and friends) are NOT mentioned in any release note. The spec
  is the more truthful changelog here.
- >-
  See openapi/_original/HARVEST.yml for the full path-level diff.