Integration guide

AI Tools

After completing the onboarding process on Yoti Hub, you can begin integrating our AI services API for retail terminals and self-checkouts.

Note: Once your organisation account is verified and you have generated the SDK ID for the 'Age Estimation' application, please contact us to have it whitelisted. This step is required to use our dedicated endpoint for this integration.

Face Capture

To ensure optimal face capture, Yoti offers the Face Capture Module (FCM), designed to capture images that meet the API’s requirements. This is available as a React/JavaScript module and a native .NET package.

Capture your images by using our Face Capture Module (FCM).

SDK Integration

To simply the integration process, Yoti provides SDKs to integrate with our API. These are available via popular dependency management systems.

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npm install -S -E yoti
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Create a request

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.

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​x
 
const PATHS = {    AGE_LIVENESS: '/age-antispoofing',};​const data = {    img: 'base64img',};​const request = new RequestBuilder()    .withBaseUrl('https://api.yoti.com/ai/v1/self-checkout')    .withPemFilePath('<YOTI_KEY_FILE_PATH>')    .withEndpoint(PATHS.AGE_LIVENESS)    .withPayload(new Payload(data))    .withMethod('POST')    .withHeader('X-Yoti-Auth-Id', '<YOTI_CLIENT_SDK_ID>')    .withHeader('Terminal-Id', '<TERMINAL_ID>')    .withHeader('Session-Id', '<SESSION_ID>') // Optional    .build();​const response = request.execute();
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JSON example:

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{    "img": "/9j/4AAQSkZJRgABAgAAAQABAAD/2wAcHNXCKigjEaYH51Me1Zy1Za0P/Z...."}
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Retrieve the results

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

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// get response body
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JSON example:

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{    "antispoofing": {        "prediction": "real"    },    "age": {        "age": 25.1,        "st_dev": 3.5    }}
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API Integration

You can also integrate with the API directly.

Endpoints

The API supports the following endpoints.

Endpoint	Description
POST https://api.yoti.com/ai/v1/self-checkout/age-antispoofing	Use Yoti's Age estimation service and the Anti-spoofing check.

Headers

The API supports the following headers:

Header	Description
X-Yoti-Auth-Id	SDK ID for the Yoti Hub application.
Terminal-Id	Unique ID per machine. Mandatory for non-browser integrations.
Session-Id	May be provided to demonstrate multiple attempts are from a single user transaction. Optional.

Request

The JSON object body for the API request has the following structure:

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{    "img": "base64encoded_image"}
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Response

The JSON object body returned from the API has the following structure:

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{   "antispoofing": {       "prediction": "real | fake"   },   "age": {       "age": float,       "st_dev": float   }}
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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 an uncertainly value. Yoti recommends rejecting any response with an uncertainty greater than 6.0. Typically this indicates a problem with image capture. This should only be treated as a quality score.

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.

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