// z.B. onSubmit: const leadId = window.ddTrack('Lead', null, { lead_source: 'Kontaktformular', value: 0 }); // leadId an euren Backend-Endpunkt mitsenden, // damit Server-CAPI dasselbe event_id verwendet. fetch('/api/lead', { method: 'POST', headers: {'Content-Type':'application/json'}, body: JSON.stringify({ /* form fields */, event_id: leadId }) });
