There's a new version of the HubSpot API
As of November 30, 2022, HubSpot API keys are no longer a supported authentication method for accessing HubSpot APIs. Instead, you should use a private app access token or OAuth to authenticate API calls. Learn more about this change and how to migrate an API key integration to use a private app instead.
When setting multiple values for a checkox property, the values should be separated with a semicolon (;).
When updating a record through the Contacts API, the property value should be a single string with all of the values separated by semicolons:
For the Forms API, make sure that the semicolons are also URL encoded: