The ID of this hidden field is:
It will likely already have information stored in its value and that data is needed to successfully complete the donation so do not delete any of the existing data.
Any data you append to this hidden field needs to follow this notation: name=value|
name = the name of the item you are sending to HubSpot.
value = the value of the item you are sending to HubSpot.
It's important that the names start with 'hubspot_'. This is necessary so that the system knows which pairs out of the hidden field to grab and include in the HubSpot integration.
Here's an example of the hidden field,
<input type="hidden" name="ctl00$cphDonationForm$hdnMiscInformation" id="cphDonationForm_hdnMiscInformation" value="RawUrl=https://raisedonors.com/donate.aspx?org=client&offer=some-offer-name&embed=true|ReferringURL=http://www.clientsite.com|Google_utm_campaign=|Google_utm_content=|Google_utm_medium=|Google_utm_source=|Google_utm_term=|BrowserInfo=Type=Mozilla|" />
And here is the same example with a few custom HubSpot data items:
<input type="hidden" name="ctl00$cphDonationForm$hdnMiscInformation" id="cphDonationForm_hdnMiscInformation" value="RawUrl=https://raisedonors.com/donate.aspx?org=client&offer=some-offer-name&embed=true|ReferringURL=http://www.clientsite.com|Google_utm_campaign=|Google_utm_content=|Google_utm_medium=|Google_utm_source=|Google_utm_term=|BrowserInfo=Type=Mozilla|hubspot_shirtsize=L|hubspot_churchname=First Baptist Gateway|hubspot_spousename=|" />
In this example we'd send the following to HubSpot,
churchname = First Baptist Gateway
shirtsize = L
spousename - would not be sent because it is empty.
If you are going to be submitting DateTime data to HubSpot, be sure to follow HubSpot's guidelines for sending DateTime.