Webhook to a 3rd Party Salesforce custom field

[Anonymous]

We have a partner in Australia that we would like to send leads directly from our forms to them, if the user is in AU.  I have the webhook set up and talking to the "standard" fields, but I am not sure how to assign a custom salesforce guid field in the webhook.  For example if one of the fields on the form is a text box and is "favorite color", and there is a mirrored field in the destination salesforce, but the guid for the "name" from salesforce for that field is something like 00875643sj867 - how do you tie the form field to that field in salesforce via the webhook?

Thanks!

[SanfordWhiteman]

If you're doing a standard url-encoded form post, use the destination form field name for the name, but the source form field for the token.

00875643sj867={{Lead.Favorite Color}}

or maybe you need to expand on your case.