Approve a signing request with a machine stamp

curl --request POST \
  --url https://api.sandbox.conduit.financial/v2/signing-requests/{id}/approve \
  --header 'Content-Type: application/json' \
  --header 'Idempotency-Key: <idempotency-key>' \
  --header 'x-api-key: <api-key>' \
  --data '
{
  "signedBody": "<string>",
  "stamp": "<string>"
}
'

import requests

url = "https://api.sandbox.conduit.financial/v2/signing-requests/{id}/approve"

payload = {
    "signedBody": "<string>",
    "stamp": "<string>"
}
headers = {
    "Idempotency-Key": "<idempotency-key>",
    "x-api-key": "<api-key>",
    "Content-Type": "application/json"
}

response = requests.post(url, json=payload, headers=headers)

print(response.text)

const options = {
  method: 'POST',
  headers: {
    'Idempotency-Key': '<idempotency-key>',
    'x-api-key': '<api-key>',
    'Content-Type': 'application/json'
  },
  body: JSON.stringify({signedBody: '<string>', stamp: '<string>'})
};

fetch('https://api.sandbox.conduit.financial/v2/signing-requests/{id}/approve', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

<?php

$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_URL => "https://api.sandbox.conduit.financial/v2/signing-requests/{id}/approve",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "POST",
  CURLOPT_POSTFIELDS => json_encode([
    'signedBody' => '<string>',
    'stamp' => '<string>'
  ]),
  CURLOPT_HTTPHEADER => [
    "Content-Type: application/json",
    "Idempotency-Key: <idempotency-key>",
    "x-api-key: <api-key>"
  ],
]);

$response = curl_exec($curl);
$err = curl_error($curl);

curl_close($curl);

if ($err) {
  echo "cURL Error #:" . $err;
} else {
  echo $response;
}

package main

import (
	"fmt"
	"strings"
	"net/http"
	"io"
)

func main() {

	url := "https://api.sandbox.conduit.financial/v2/signing-requests/{id}/approve"

	payload := strings.NewReader("{\n  \"signedBody\": \"<string>\",\n  \"stamp\": \"<string>\"\n}")

	req, _ := http.NewRequest("POST", url, payload)

	req.Header.Add("Idempotency-Key", "<idempotency-key>")
	req.Header.Add("x-api-key", "<api-key>")
	req.Header.Add("Content-Type", "application/json")

	res, _ := http.DefaultClient.Do(req)

	defer res.Body.Close()
	body, _ := io.ReadAll(res.Body)

	fmt.Println(string(body))

}

HttpResponse<String> response = Unirest.post("https://api.sandbox.conduit.financial/v2/signing-requests/{id}/approve")
  .header("Idempotency-Key", "<idempotency-key>")
  .header("x-api-key", "<api-key>")
  .header("Content-Type", "application/json")
  .body("{\n  \"signedBody\": \"<string>\",\n  \"stamp\": \"<string>\"\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://api.sandbox.conduit.financial/v2/signing-requests/{id}/approve")

http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true

request = Net::HTTP::Post.new(url)
request["Idempotency-Key"] = '<idempotency-key>'
request["x-api-key"] = '<api-key>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"signedBody\": \"<string>\",\n  \"stamp\": \"<string>\"\n}"

response = http.request(request)
puts response.read_body

{
  "id": "<string>",
  "transactionId": "<string>",
  "customerId": "<string>",
  "requiredApprovals": 0,
  "approvedCount": 0,
  "expiresAt": "2026-01-15T09:30:00.000Z",
  "createdAt": "2026-01-15T09:30:00.000Z",
  "approvalMaterial": {
    "version": "1",
    "activityId": "<string>",
    "fingerprint": "<string>",
    "subOrganizationId": "<string>",
    "outbound": {
      "toAddress": "<string>",
      "assetAmount": {
        "amount": "<string>"
      }
    }
  }
}

{
  "type": "INVALID_OID_FORMAT",
  "title": "Invalid Object ID Format",
  "status": 400,
  "detail": "A path or query parameter expected a valid object identifier but received a value that does not match the expected format.",
  "resolution": "Verify that all IDs in the request URL and query parameters are correctly formatted. IDs are typically prefixed strings like 'cus_...', 'app_...', or 'doc_...'.",
  "docs": "https://conduit-v2.mintlify.app/errors#invalid-oid-format",
  "instance": "/v2/...",
  "correlationId": "req_a1b2c3d4",
  "timestamp": "2026-01-15T09:30:00.000Z"
}

{
  "type": "API_KEY_MISSING",
  "title": "API Key Missing",
  "status": 401,
  "detail": "The request did not include an API key. All API requests must be authenticated.",
  "resolution": "Include your API key in the 'x-api-key' header with every request.",
  "docs": "https://conduit-v2.mintlify.app/errors#api-key-missing",
  "instance": "/v2/...",
  "correlationId": "req_a1b2c3d4",
  "timestamp": "2026-01-15T09:30:00.000Z"
}

{
  "type": "API_KEY_READ_ONLY",
  "title": "API Key Is Read-Only",
  "status": 403,
  "detail": "This API key has read-only access and cannot perform write operations. Read-only keys may make read requests (GET, HEAD, OPTIONS) only.",
  "resolution": "Use a read-write API key for this request, or have an organization admin mint one from the dashboard.",
  "docs": "https://conduit-v2.mintlify.app/errors#api-key-read-only",
  "instance": "/v2/...",
  "correlationId": "req_a1b2c3d4",
  "timestamp": "2026-01-15T09:30:00.000Z"
}

{
  "type": "SIGNING_REQUEST_NOT_FOUND",
  "title": "Signing request not found",
  "status": 404,
  "detail": "No signing request with this id exists for your account. The same response is returned for an id that belongs to another account, so a 404 never confirms that an id exists elsewhere.",
  "resolution": "List your actionable signing requests with GET /v2/signing-requests and use an id from that list. The transaction.awaiting_signature webhook also delivers the id directly as signingRequestId (programmatic mode).",
  "docs": "https://conduit-v2.mintlify.app/errors#signing-request-not-found",
  "instance": "/v2/...",
  "correlationId": "req_a1b2c3d4",
  "timestamp": "2026-01-15T09:30:00.000Z"
}

{
  "type": "IDEMPOTENCY_KEY_CONFLICT",
  "title": "Idempotency Key Conflict",
  "status": 409,
  "detail": "The idempotency key was previously used with a different request body. Idempotency keys are bound to the exact request shape — replays must match the original.",
  "resolution": "Use a fresh idempotency key for the new request, or replay the original request unchanged.",
  "docs": "https://conduit-v2.mintlify.app/errors#idempotency-key-conflict",
  "instance": "/v2/...",
  "correlationId": "req_a1b2c3d4",
  "timestamp": "2026-01-15T09:30:00.000Z"
}

{
  "type": "UNSUPPORTED_MEDIA_TYPE",
  "title": "Unsupported Media Type",
  "status": 415,
  "detail": "The request carries a body with a Content-Type this endpoint cannot parse. JSON endpoints accept 'application/json'; a body with no Content-Type header at all is assumed to be JSON. File-upload endpoints accept only 'multipart/form-data' — JSON or undeclared bodies are rejected there.",
  "resolution": "Send the request body with the 'Content-Type: application/json' header. For file uploads, use 'Content-Type: multipart/form-data' — upload endpoints accept no other body type.",
  "docs": "https://conduit-v2.mintlify.app/errors#unsupported-media-type",
  "instance": "/v2/...",
  "correlationId": "req_a1b2c3d4",
  "timestamp": "2026-01-15T09:30:00.000Z"
}

{
  "type": "SIGNING_STAMP_INVALID",
  "title": "Signing stamp is invalid",
  "status": 422,
  "detail": "The submitted stamp could not be verified: it is not a well-formed P-256 stamp, its signature does not match the signed body, or the signed body does not authorize this exact signing request (its activity fingerprint, sub-organization, or request type does not match).",
  "resolution": "Re-fetch the signing request's approval material with GET /v2/signing-requests/{id}, rebuild the approve/reject activity body exactly as returned, and stamp it with your machine signer's P-256 api key.",
  "docs": "https://conduit-v2.mintlify.app/errors#signing-stamp-invalid",
  "instance": "/v2/...",
  "correlationId": "req_a1b2c3d4",
  "timestamp": "2026-01-15T09:30:00.000Z"
}

{
  "type": "RATE_LIMITED",
  "title": "Rate Limited",
  "status": 429,
  "detail": "Too many requests. This error is returned by three independent checks: the per-organization bucket applied to every authenticated API request; the per-IP bucket applied to unauthenticated traffic before an API key is validated; and the per-IP bucket applied when repeated invalid API keys are submitted from the same address. Honor the Retry-After header (also exposed as retryAfterSeconds in the body) before retrying. Current limits and remaining budget are visible in X-RateLimit-Limit, X-RateLimit-Remaining, and X-RateLimit-Reset on rate-limited route responses.",
  "resolution": "Sleep until Retry-After seconds have elapsed, then retry. For sustained workloads exceeding the per-organization defaults, request a rate-limit increase through your support contact.",
  "docs": "https://conduit-v2.mintlify.app/errors#rate-limited",
  "instance": "/v2/...",
  "correlationId": "req_a1b2c3d4",
  "timestamp": "2026-01-15T09:30:00.000Z",
  "retryAfterSeconds": 3
}

{
  "type": "INTERNAL_ERROR",
  "title": "Internal Error",
  "status": 500,
  "detail": "An unexpected error occurred while processing your request.",
  "resolution": "Retry the request after a brief delay. If the error persists, contact support and include the correlationId from the error response for investigation.",
  "docs": "https://conduit-v2.mintlify.app/errors#internal-error",
  "instance": "/v2/...",
  "correlationId": "req_a1b2c3d4",
  "timestamp": "2026-01-15T09:30:00.000Z"
}

{
  "type": "SIGNING_PROVIDER_UNAVAILABLE",
  "title": "Signing Provider Unavailable",
  "status": 502,
  "detail": "The signing provider returned a transient upstream error (network failure, timeout, rate limit, or 5xx) rather than a definitive verdict on the stamped request. The signer is authenticated and the request itself is fine — the provider just couldn't be reached right now.",
  "resolution": "Retry the request after a brief delay. Do not re-authenticate — the session is still valid.",
  "docs": "https://conduit-v2.mintlify.app/errors#signing-provider-unavailable",
  "instance": "/v2/...",
  "correlationId": "req_a1b2c3d4",
  "timestamp": "2026-01-15T09:30:00.000Z"
}