Webhook to Update SFDC Case Web Fields

[Anonymous]

Is it possible to update Salesforce's Web Email, Web Name, Web Company, and Web Phone fields via a Webhook? I've made the fields editable in the page layouts, but so far, the webhook does not update them. Here's the Webhook code I'm using:

&SuppliedEmail={{Lead.Email Address}}

&SuppliedCompany={{Lead.Company Name}}

&SuppliedName={{Lead.First Name%20Lead.Last Name}}

&SuppliedPhone={{Lead.Phone Number}}

Is there a way to get this to work?

Thanks

[SanfordWhiteman]

Leaving the Webhook aside -- since it's the hardest part to be debug directly -- what happens if you visit the Web2Case form directly?  Is it filled in then?

[Anonymous]

Thanks for the reply - It's a Marketo form that's embedded in our app and in our website, so I was trying to make things work without having to ask the dev teams to recode all of that.