How bout giving it a try for a system that can work things out with your Leads list, pushing/pulling your list out of the CRM you know and love with EASE? This is all possible with Aloware.
The Contacts API will only accept JSON formatted data in the body of the request. We don’t have any options to accept data from the query parameters in the URL.
We do accept application/x-www-form-urlencoded data when using the Forms API:
POST https://forms.hubspot.com/uploads/form/v2/:portal_id/:form_guid - Send form submission data to HubSpot. Form submissions from external sources can be made to any registered HubSpot form. You can see a list of forms on your portal by going to...
Also, I deactivated the hapikey you originally posted, since that key provides access to all of the data stored in your HubSpot account. You’ll need to generate a new API key from the Integrations > Get your HubSpot API Key screen.