HubSpot doesn’t adequately explain how to pass in boolean values through its Forms API. I recently had to work with this API and wrote down some hints.
Hubspot Checkbox Field API

> curl –request POST -H “Content-Type: application/x-www-form-urlencoded” –data “[email protected]&firstname=John&lastname=Doe&company=ACME&phone=1112223333&message=blah&opt_in=true” “https://forms.hubspot.com/uploads/form/v2/123456/b7a12320e-ea5b-1234-4321-331623610e61”

The important bit here is that fields of type “Single On/Off Checkbox” require the text “true” or “false” despite being rendered as “Yes” or “No” in Hubspot. In C#, it’s important, when formatting text, to pass in string values instead of relying on string format processing within .NET to convert your boolean correctly. ┬áIt’s also important you’re passing in data with the Content Type set to “application/x-www-form-urlencoded” or it may misinterpret the values being passed in (or reject the request).

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