Fill Form SS-8 programmatically

What you send

Real field names, straight from the PDF — the excerpt shows the first 5 of 299. The full list is in the table below, and the template hands you the complete JSON schema to copy.

{
  "data": {
    "topmostSubform[0].Page1[0].FirmInfo[0].f1_1[0]": "string",
    "topmostSubform[0].Page1[0].FirmInfo[0].f1_2[0]": "string",
    "topmostSubform[0].Page1[0].FirmInfo[0].f1_3[0]": "string",
    "topmostSubform[0].Page1[0].FirmInfo[0].f1_4[0]": "string",
    "topmostSubform[0].Page1[0].FirmInfo[0].f1_5[0]": "string"
  }
}
// …plus 294 more fields, all listed below

What you get back

The completed Form SS-8, 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 SS-8 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.