Integration guide

AI Tools

After completing the Yoti onboarding, you will need to complete authentication for the API by using the Yoti SDK to simplify the process.

SDK Integration

Yoti backend SDKs are available via popular dependency management systems

npm install -S -E yoti

// If you are using Maven, add the following dependency: <dependency> <groupId>com.yoti</groupId> <artifactId>yoti-sdk-api</artifactId> <version>4.1.0</version> </dependency> // If you are using Gradle, add the following dependency: compile group: 'com.yoti', name: 'yoti-sdk-api', version: '4.1.0'

// Get the Yoti PHP SDK library via a Composer package composer require yoti/yoti-php-sdk

pip install yoti

// To install the Yoti NuGet package you will need to install NuGet. // To import the latest Yoti SDK into your project, enter the following // command from NuGet Package Manager Console in Visual Studio: Install-Package Yoti // For other installation methods, see https://www.nuget.org/packages/Yoti

// Simply add this as an import: import "github.com/getyoti/yoti-go-sdk/v3" // Or add the following line to your go.mod file require github.com/getyoti/yoti-go-sdk/v3 // Or you can run the following command in your terminal: go get github.com/getyoti/yoti-go-sdk/v3

You can create three types of requests using the API:

Endpoint	Description
https://api.yoti.com/ai/v1/age?secure=true	Use Yoti's Age estimation service. Yoti strongly recommends you couple this with liveness.
https://api.yoti.com/ai/v1/antispoofing?secure=true	Use Yoti's Anti-spoofing (liveness) check.
https://api.yoti.com/ai/v1/age-antispoofing?secure=true	Use Yoti's Age estimation service and the Anti-spoofing (liveness) check.

Once you have added the Yoti SDK dependency to your project, you can use it to build and send your request. See the code snippets below for examples.

import java.io.File; import org.json.JSONObject; import com.yoti.api.client.spi.remote.call.SignedRequest; import com.yoti.api.client.spi.remote.call.SignedRequestBuilderFactory; import com.yoti.api.client.spi.remote.call.SignedRequestResponse; import com.yoti.api.client.KeyPairSource; import com.yoti.api.client.spi.remote.KeyStreamVisitor; import static com.yoti.api.client.FileKeyPairSource.fromFile; private final KeyPairSource fileKeyPairSource; private final java.security.KeyPair keyPair; String AGE = "/age"; String LIVENESS = "/antispoofing"; String AGE_LIVENESS = "/age-antispoofing"; this.fileKeyPairSource = fromFile(new File("<PEM_FILE_PATH>")); this.keyPair = fileKeyPairSource.getFromStream(new KeyStreamVisitor()); JSONObject body = new JSONObject(); body.put("img", requestPayload.get("img")); body.put("metadata", requestPayload.get("metadata")); // Optional, but recommended body.put("secure", requestPayload.get("secure")); byte[] payload = body.toString().getBytes(java.nio.charset.StandardCharsets.UTF_8); SignedRequestBuilderFactory signedRequestBuilderFactory = new SignedRequestBuilderFactory(); SignedRequest signedRequest = signedRequestBuilderFactory.create() .withKeyPair(keyPair) .withBaseUrl("https://api.yoti.com/ai/v1/") .withEndpoint(AGE_LIVENESS) // optionally AGE or LIVENESS .withHttpMethod("POST") .withHeader("X-Yoti-Auth-Id", "<YOTI_CLIENT_SDK_ID>") .withQueryParameter("secure", true) .withPayload(payload) .build(); SignedRequestResponse response = signedRequest.execute(); int statusCode = response.getResponseCode(); byte[] responseBody = response.getResponseBody(); Map<String, List<String>> headers = response.getResponseHeaders();

<?php use Yoti\Http\RequestBuilder; use Yoti\Http\Payload; $payload = [ "img" => "base64_image", "metadata" => ["device" => "mobile"], // or laptop "secure" => [ "version" => "<module version>", "token" => "<session jwt>", "signature" => "<payload>", "verification" => "<verification_data"> ], ]; $request = (new RequestBuilder()) ->withBaseUrl('https://api.yoti.com/ai/v1') ->withPemFilePath('<YOTI_KEY_FILE_PATH>') ->withEndpoint('/age-antispoofing') ->withPayload(Payload::fromJsonData($payload)) // For version < 3, use ->withPayload(new Payload($payload)) ->withMethod('POST') ->withHeader('X-Yoti-Auth-Id', '<YOTI_CLIENT_SDK_ID>') ->withQueryParam('secure', true) ->build(); // Execute request $response = $request->execute(); // Get response body $body = $response->getBody();

from yoti_python_sdk.http import SignedRequest, RequestHandler import json import requests def yoti_age_estimation(): data = { "img": "base64_image", "metadata": { "device": "mobile" // # or laptop }, "secure": { "version": "<module version>", "token": "<session jwt>", "signature": "<payload>", "verification": "<verification_data>" } } payload_string = json.dumps(data).encode() signed_request = ( SignedRequest .builder() .with_pem_file("<YOTI_KEY_FILE_PATH>") .with_base_url("https://api.yoti.com/ai/v1") .with_endpoint("/age-antispoofing") .with_http_method("POST") .with_header("X-Yoti-Auth-Id", "<YOTI_CLIENT_SDK_ID>") .with_param("secure", True) .with_payload(payload_string) .build() ) # get Yoti response response = signed_request.execute() response_payload = json.loads(response.text)

using System; using System.IO; using System.Net.Http; using System.Text; using Microsoft.AspNetCore.Mvc; using Yoti.Auth.Web; HttpClient httpClient = new HttpClient(); StreamReader privateKeyStream = System.IO.File.OpenText(_pemFilePath); var metadata = new { device = "mobile", // or laptop }; var secure = new { version = "<module version>", token = "<session jwt>", signature = "<payload>", verification = "<verification_data>" }; var bodyObj = new { img = _base64Face, metadata = metadata, secure = secure }; string serializedRequest = Newtonsoft.Json.JsonConvert.SerializeObject(bodyObj); byte[] byteContent = Encoding.UTF8.GetBytes(serializedRequest); Uri _baseUrl = new UriBuilder("https", "api.yoti.com", 443, "ai/v1").Uri; Yoti.Auth.Web.Request ageScanRequest = new RequestBuilder() .WithStreamReader(privateKeyStream) .WithBaseUri(_baseUrl) .WithEndpoint("/age-antispoofing") .WithHttpMethod(HttpMethod.Post) .WithContent(byteContent) .WithHeader("X-Yoti-Auth-Id", _clientSdkId) .Build(); HttpResponseMessage response = ageScanRequest.Execute(httpClient).Result;

import ( "io/ioutil" "net/http" "github.com/getyoti/yoti-go-sdk/v3/requests" ) key, _ := ioutil.ReadFile("<YOTI_KEY_FILE_PATH>") imageBase64 := base64.StdEncoding.EncodeToString("<base64_image>") metadata := map[string]interface{}{ "device":"mobile" // or laptop } secure := map[string]interface{}{ "version":"<module_version>", "token":"<session jwt>", "signature":"<payload>", "verification":"<verification_data>" } bodyObj := map[string]interface{}{ "img": imageBase64, "metadata": metadata, "secure": secure, } payload, _ := json.Marshal(bodyObj) // Create session request,_ := requests.SignedRequest{ HTTPMethod: http.MethodPost, BaseURL: "https://api.yoti.com/ai/v1", Endpoint: "/antispoofing", Headers: map[string][]string{ "Content-Type": {"application/img"}, "Accept": {"application/img"}, "X-Yoti-Auth-Id":{"<YOTI_CLIENT_SDK_ID>"}, }, Body: payload, }.WithPemFile(key).Request() //get Yoti response response, _ := http.DefaultClient.Do(request)

The JSON string for the payload must be in the following format. This is sent with the withPayload method provided in the SDK. The face capture module will automatically return “img” and “secure” on success. Do not modify these fields manually.

{ "img": "base64_image", "metadata": { "device": "mobile" // or laptop }, "secure": { "version": "<module_version>", "token": "<session_token>", "signature": "<result_signature>", "verification": "<verification_data>" } }

Parameter	Description
img	Base64 encoded image.
metadata	(optional) Device used to send the request (can be a string of `unknown`, `laptop`, `mobile` or any value).
secure	Secure information required by Secure Image Capture (SICAP) that certifies the image was not modified. The Yoti Face Capture Module provides this and shouldn't be edited.

Multiframe

If you are using Multiframe in the Face Capture Module (FCM), you must add the query parameter multiframe=true to your backend API request. Note that the payload size will be slightly larger when Multiframe is enabled.

If the Multiframe setting in the FCM does not match the multiframe query parameter in your request, the response will always be UNTRUSTED_SECURE_SESSION .

Retrieve the results

The endpoint will return the Anti-spoofing result alongside Age estimation.

{ "antispoofing": { "prediction": "real" // or fake }, "age": { "st_dev": float, "age": float } }

Response	Explained
Prediction - real	Yoti has detected a real user.
Prediction - fake	Yoti has detected a spoof attempt.
Age - age	The age estimation of the user.
Age - st_dev	The st_dev value is a quality score. Yoti advises rejecting any response with a value higher than 6.0, as this usually suggests an issue with image capture.

Error codes

In case of any failure, you will receive the following error responses:

Error code	Error	Description
404	APP_NOT_FOUND	Application app_id not found.
401	INVALID_X_YOTI_AUTH_ID	X-Yoti-Auth-Id header not provided. auth id is not a valid uuid.
400	INVALID_APP_ID	Application id cannot be empty.
400	INVALID_PUBLIC_KEY	Application public key cannot be empty.
403	DISABLED_APP_STATE	Application must be enabled.
400	INVALID_ORG_ID	Organisation id cannot be empty.
400	INVALID_BILLING_SOURCE_ID	Application billing source id cannot be empty.
404	ORG_NOT_FOUND	Organisation org_id not found.
401	INVALID_YOTI_AUTH_DIGEST	X-Yoti-Auth-Digest header is missing. X-Yoti-Auth-Digest is not base64 encoded.
401	INVALID_NONCE	Nonce is missing. nonce parameter is mandatory Provided nonce is not a valid uuid.
401	INVALID_TIMESTAMP	Timestamp is missing. timestamp parameter is mandatory. Provided timestamp is not a valid unix timestamp.
401	INVALID_PUBLIC_KEY_ENCODING	Failed to load public key. key is not der encoded.
401	UNSUPPORTED_ALGORITHM	Serialised key is of a type that is not supported by the backend.
401	INVALID_SIGNATURE	Failed to verify signature.
403	INVALID_ORG_STATUS	Organisation has an invalid status.
404	INVALID_METADATA_DEVICE	Invalid device metadata provided.
400	INVALID_BODY_ENCODING	Request body should be a valid JSON.
404	INVALID_ENDPOINT	The endpoint request is invalid.
413	PAYLOAD_TOO_LARGE	Payload too large.
400	IMAGE_NOT_PROVIDED	Image has not been provided.
400	INVALID_B64_IMAGE	Base64 image is incorrectly padded. Cannot create image from base64 decoded bytes
400	UNSUPPORTED_IMAGE_FORMAT	Image format not supported. Please use JPEGs (95 to 100 quality) and PNGs.
400	IMAGE_SIZE_TOO_BIG	Image size too big, the maximum size is 1.5MB.
400	IMAGE_SIZE_TOO_SMALL	Image size too small, the minimum size is 50KB.
400	MIN_HEIGHT	The image height is incorrect. Image minimum height required is 300 pixels.
400	MAX_HEIGHT	The image height is incorrect. Image maximum height required is 2000 pixels.
400	MIN_WIDTH	The image width is incorrect. Image minimum width required is 300 pixels.
400	MAX_WIDTH	The image width is incorrect. Image maximum width required is 2000 pixels.
400	MIN_PIXELS	To process the image the minimum number of pixels required is 90,000 pixels.
400	MAX_PIXELS	To process the image the maximum number of pixels required is 2,100,000 pixels.
400	IMAGE_WRONG_CHANNELS	Missing colour channel, the input image must be RGB or RGBA.
400	IMAGE_GRAYSCALE_NOT_SUPPORTED	Grayscale images not supported.
503	SERVICE_UNAVAILABLE	The service is temporarily unavailable.
400	FACE_NOT_FOUND	Face not found.
400	MULTIPLE_FACES	Multiple faces in the image provided.
400	FACE_BOX_TOO_SMALL	The face in the image provided is too small.
400	FACE_TO_IMAGE_RATIO_TOO_LOW	Face ratio is lower than the minimum ratio.
400	FACE_TO_IMAGE_RATIO_TOO_HIGH	Face ratio is bigger than the maximum ratio.
400	INSUFFICIENT_AREA_AROUND_THE_FACE	Insufficient area around the face in the image provided.
400	IMAGE_TOO_BRIGHT	Image too bright..
400	IMAGE_TOO_DARK	Image too dark.
400	INVALID_LEVEL_OF_ASSURANCE	Invalid antispoofing level of assurance provided.
400	INVALID_REQUEST_BODY	Request body is invalid, '-' field is invalid.
400	INVALID_IMG_VALIDATION_LEVEL	The image validation level is invalid.
401	UNAUTHORIZED	The X-Yoti-Auth-Id provided isn't authorized to access this resource.
500	FAIL_PREDICTION	Age distribution is empty. Standard deviation is empty. Cannot build model result. Antispoofing prediction failed.
500	UNSPECIFIED_ERROR	An internal server error occurred.
400	SECURE_REQUEST_IS_EMPTY	Secure request field is empty.
400	SECURE_SESSION_NOT_FOUND	Secure session not found.
400	SECURE_SIGNATURE_NOT_FOUND	Secure signature not found.
400	SECURE_VERSION_NOT_FOUND	Secure version not found.
400	INVALID_SECURE_SIGNATURE	Failed to verify secure session signature.
400	SECURE_VERIFICATION_NOT_FOUND	Secure verification not found.
400	UNTRUSTED_SECURE_SESSION	Untrusted secure session
401	INVALID_SECURE_SESSION	Invalid secure session token.

If requesting age only, the response will look as follows:

{ "age": float, "st_dev": float }

If integrating into a non-browser client, we recommend contacting us here for additional support.

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