Open-Gateway API V1 save_alt

This API provides methods to obtain the capabilities of CAMARA project in mas-stack.

The functionality it will currently have will be for AuthN and its purpose will be, given an MSISDN, scope, purpose and application, to return whether the MSISDN gives consent for the capability query to be performed for the indicated application.

Service Enabling Network Function API to verify that the provided mobile phone number is the one used in the device. It verifies that the user is using a device with the same mobile phone number as it is declared.
It also makes it possible for a Service provider to verify the number itself by returning the phone number associated to the authenticated user’s access token.

In this API phone number term refers to the mobile phone number.

Introduction

Number Verification API performs real-time checks to verify the phone number of the mobile device being used to access a service provider (SP) service, where the mobile device is accessing the service provider over a mobile network (WiFi connections are out of this API scope) either by getting the comparison result or receiving the phone number of the device that it is used, so they can verify it themselves.

It uses direct mobile network connections to verify possession of a phone number in the background without requiring user interaction. There are neither OTPs (One-time passwords) received by SMS nor authenticator app downloads, so it is much simpler. It can be used at sign up, login, or transaction time to validate that a user’s SIM (Subscriber Identity Module) is both actively connected to the mobile network and not spoofed or cloned.

Relevant Definitions and Concepts

• Network-Based Authentication: Authentication mechanism based on the identification of the endpoint of a network connection. Network operators know to which subscriber a network resource is assigned at a given moment, for example the mobile phone number associated to a specific mobile network connection.

API Functionality

This enables a Service Provider (SP) to verify the phone number of the mobile device being used to access their service where the mobile device is accessing the service provider over a mobile network (WiFi connections are out of this API scope). This can happen either by getting the comparison result or receiving the phone number of the device that is used, so they can verify it themselves.

Resources and Operations overview

This API currently provides two endpoints where both require a 3-legged token and authentication via mobile network (excluding for example by SMS/OTP or user/password as an authentication method):

• The first one checks if the user mobile phone number matches the phone number associated with the mobile device. It can receive either a hashed or a plain text phone number as input and it compares the received input with the authenticated user’s phone number associated to the access token in order to respond true/false.

Sequence Diagram

Number Verification API uses the standard OIDC Authorization Code Flow . The following diagram will help to clarify the end-to-end process, including previous steps prior to this API call.

Note that the diagram shows just an example of a direct integration from developer’s application and MNO’s authserver and API, other scenarios of indirect integration via Aggregator/Channel Partner should also be considered. Specific authorization flows may apply, as defined by e.g. GSMA Open Gateway (OGW).

Authorization and authentication

The “Camara Security and Interoperability Profile” provides details on how a client requests an access token. Please refer to Identify and Consent Management (https://github.com/camaraproject/IdentityAndConsentManagement/) for the released version of the Profile.

Which specific authorization flows are to be used will be determined during onboarding process, happening between the API Client and the Telco Operator exposing the API, taking into account the declared purpose for accessing the API, while also being subject to the prevailing legal framework dictated by local legislation.

It is important to remark that in cases where personal user data is processed by the API, and users can exercise their rights through mechanisms such as opt-in and/or opt-out, the use of 3-legged access tokens becomes mandatory. This measure ensures that the API remains in strict compliance with user privacy preferences and regulatory obligations, upholding the principles of transparency and user-centric data control.

In the case of the Number Verification API scenario and according to the API definition, 3-legged access tokens must be used by API clients to invoke this API with dedicated scope. The API client must authenticate on behalf of a specific user to use this service. This must be done via mobile network authentication.

Further info and support

GSMA Mobile Connect Verified MSISDN specification was used as source of input for this API. For more about Mobile Connect, please see Mobile Connect website .

The SIM swap API provides a programmable interface for developers and other users (capabilities consumers) to request the last date of a SIM swap performed on the mobile line, or, to check whether a SIM swap has been performed during a past period.

Introduction

The SIM Swap API performs real-time checks on the last SIM Swap event.

The SIM Swap API is useful to prevent fraud by reducing the risk of account takeover fraud by strengthening SIM based authentication processes such as SMS One-time passwords. Fraudsters are using SIM swap techniques to intercept SMS messages and reset passwords or receive verification codes that allow them to access protected accounts.

The SIM Swap API can also be used to protect non-automated actions. For example, when a call center expert contacts a user to clarify or confirm a sensitive operation.

This API is used by an application to get information about a mobile line latest SIM swap date. It can be easily integrated and used through this secured API and allows SPs (Service Provider) to get this information an easy & secured way. The API provides management of 2 endpoints answering 2 distinct questions:

• When did the last SIM swap occur?
• Has a SIM swap occurred during last n hours?

Relevant terms and definitions

SIM swap:
A SIM swap is a process in which a user’s mobile phone number (MSISDN) is associated with a new SIM card (IMSI). This is typically done by contacting the user’s mobile service provider and requesting a new SIM card for various reasons, such as a lost or damaged SIM card or upgrading to a new phone.

SIM swap also happens during other actions like changing user’s phone number, changing mobile service provider keeping user’s mobile phone number or when activating a new SIM associated to the same phone number, known as multisim service. New subscription is considered as a SIM swap as well, the MSISDN which can be used by another person earlier, is associated with a SIM card it was not associated before.

API functionality

The API provides 2 operations:

• POST retrieve-date : Provides timestamp of latest SIM swap, if any, for a given phone number. If no swap has been performed, the API will return the SIM activation date (the timestamp of the first time that the sim connected to the network) by default, unless this is not possible due to local regulations preventing the safekeeping of the information for longer than the stated period of time. If this is the case, a null value will be returned.

• POST check: Checks if SIM swap has been performed during a past period (defined in the request with ‘maxAge’ attribute) for a given phone number.

Authorization and authentication

The “Camara Security and Interoperability Profile” provides details on how a client requests an access token. Please refer to Identify and Consent Management (https://github.com/camaraproject/IdentityAndConsentManagement/) for the released version of the Profile.

Which specific authorization flows are to be used will be determined during onboarding process, happening between the API Client and the Telco Operator exposing the API, taking into account the declared purpose for accessing the API, while also being subject to the prevailing legal framework dictated by local legislation.

It is important to remark that in cases where personal user data is processed by the API, and users can exercise their rights through mechanisms such as opt-in and/or opt-out, the use of 3-legged access tokens becomes mandatory. This measure ensures that the API remains in strict compliance with user privacy preferences and regulatory obligations, upholding the principles of transparency and user-centric data control.

Identifying a phone number from the access token

This specification defines the phoneNumber field as optional in API requests, specifically in cases where the API is accessed using a 3-legged access token, and the phone number can be uniquely identified by the token. This approach simplifies API usage for API consumers by relying on the information associated with the access token used to invoke the API.

Handling of phone number information:

Optional phoneNumber field for 3-legged tokens:

• When using a 3-legged access token, the phone number associated with the access token must be considered as the phone number for the API request. This means that the phoneNumber field is not required in the request, and if included it must identify the same phone number, therefore it is recommended NOT to include it in these scenarios to simplify the API usage and avoid additional validations.

Validation mechanism:

• The server will extract the phone number identification from the access token, if available.
• If the API request additionally includes a phoneNumber field when using a 3-legged access token, the API will validate that the phone number provided matches the one associated with the access token.
• If there is a mismatch, the API will respond with a 403 - INVALID_TOKEN_CONTEXT error, indicating that the phone number information in the request does not match the token.

Error handling for unidentifiable phone number:

• If the phoneNumber field is not included in the request and the phone number information cannot be derived from the 3-legged access token, the server will return a 422 UNIDENTIFIABLE_PHONE_NUMBER error.

Restrictions for tokens without an associated authenticated phone number:

• For scenarios which do not have a phone number associated to the token during the authentication flow, e.g. 2-legged access tokens, the phoneNumber field MUST be provided in the API request. This ensures that the phone number is explicit and valid for each API call made with these tokens.

Further info and support

GSMA Mobile Connect Account Takeover Protection specification was used as source of input for this API. For more about Mobile Connect, please see Mobile Connect website .

(FAQs will be added in a later version of the documentation)

Security

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