Fill Form W-7 programmatically

What you send

Real field names, straight from the PDF — the excerpt shows the first 5 of 69. The full list is in the table below, and the template hands you the complete JSON schema to copy.

{
  "data": {
    "topmostSubform[0].Page1[0].c1_1[0]": true,
    "topmostSubform[0].Page1[0].c1_1[1]": true,
    "topmostSubform[0].Page1[0].c1_2[0]": true,
    "topmostSubform[0].Page1[0].c1_3[0]": true,
    "topmostSubform[0].Page1[0].c1_4[0]": true
  }
}
// …plus 64 more fields, all listed below

What you get back

The completed Form W-7, streamed back as the response — or delivered to your webhook, HMAC-signed.

curl -X POST https://www.doc2api.co/api/v1/templates/<ID>/fill \
  -H "X-Api-Key: d2a_live_…" \
  -H "Content-Type: application/json" \
  -d @payload.json -o filled.pdf
# → the completed Form W-7 as a PDF.
#   With a webhook configured, the reply is JSON and the
#   document arrives at your endpoint as a signed URL.

Or skip the mapping entirely: embed the actual form on your site and let the person it belongs to fill and sign it — you receive the values as JSON and the finished PDF.