Developer Support

APIs & Integrations Ask questions and find answers about HubSpot’s APIs. CMS Development All things CMS Development. Ask questions. Give advice. Come join the Developer Community! Developer Announcements A place to read about Developer focused product releases, changes and events

Topic	Replies	Views	Activity
About the Developer Support category Developer Support	0	204	June 12, 2026
SOAP API v41.0 Retirement — HubSpot Integration Package v3.0.1 APIs & Integrations best-practices	2	11	September 4, 2026
Receiving a MISSING_SCOPES error when calling the leads API, despite the access token containing crm APIs & Integrations oauth	5	1208	September 4, 2026
Developer updates for August 2026 Developer Announcements announcements	2	88	September 4, 2026
LCP issue: longer than 2.5s (mobile) CMS Development professional	4	1968	September 3, 2026
Breeze intelligence and custom CSS Developer Support breeze	5	35	September 3, 2026
Will the new 2026 API support object webhooks in HubSpot? APIs & Integrations crm , crm-objects-contacts-companies-deals-tickets , events , webhooks	1	18	September 3, 2026
Why are workflow user IDs missing in HubSpot API responses? APIs & Integrations developer	1	24	September 3, 2026
Is it possible to create a legacy CRM public app? Need for migration testing Developer Support cms-development-tools	1	23	September 2, 2026
File Upload in Custom Integration APIs & Integrations sdk	12	648	September 2, 2026
Validating Properties AND Form Fields through the HubSpot Forms API APIs & Integrations developer-tools	6	62	September 2, 2026
/automation/v4/flows/performance has no dated successor ahead of the v4 sunset APIs & Integrations developer	6	56	September 2, 2026
Property history identifies the write event for workflow changes, not the workflow APIs & Integrations developer	4	24	September 2, 2026
What are the best Courses for Developers Building Native HubSpot Ai RevOps system? Developer Support starter , professional	1	19	September 1, 2026
Signature issue using office365 with Hubspot plugin CMS Development	5	2239	September 1, 2026
Apps to Projects Migration webhook issue APIs & Integrations professional	5	696	September 1, 2026
External HubSpot form: localized consent language and DACH DOI handling across Umbraco pages Developer Support format-data-actions , cms-development-tools	2	28	September 1, 2026
Anyone integrate with Postal? APIs & Integrations marketing , enterprise	2	31	September 1, 2026
How to use Secrets with Python custom code automation APIs & Integrations	6	4305	September 1, 2026
How to integrate a gratuity calculator API into HubSpot workflows? APIs & Integrations free	4	803	August 31, 2026
Merging contacts (now) creates a NEW ID? APIs & Integrations contacts	6	1249	August 28, 2026
App listing validator rejects setup doc URL both ways (lowercase = "misspelled", capitalized = 404) Developer Support third-party-apps	2	39	August 21, 2026
HubSpot CLI project validate and upload fail with HTTP 500 on project-schema endpoint APIs & Integrations developer-tools	1	29	August 21, 2026
Issue with Child Theme Developer Support free	6	84	August 28, 2026
Agent Tool testing blocked by credits Developer Support third-party-apps , contact-support , breeze , app-marketplace	3	49	August 28, 2026
HubSpot Embedded Form Callbacks Not Firing (onFormSubmit / onFormSubmitted) – Unable to Redirect Aft APIs & Integrations forms	4	1417	August 28, 2026
Meetings booked via Scheduler v3 API don't get native Google Meet conferencing (AI Notetaker never Developer Support developer-tools	3	36	August 27, 2026
Re: Adding <fieldset> lacks a <legend> element as first child HubSpot Forms CMS Development professional	5	1901	August 27, 2026
Legacy Private App Creation Being Disabled Developer Support announcements	0	40	August 27, 2026
Request for Guidance on Hierarchical Property Mapping in HubSpot MCP Integration APIs & Integrations free , developer-tools	1	26	August 27, 2026