> For the complete documentation index, see [llms.txt](https://framework.ishare.eu/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://framework.ishare.eu/use-cases/use-case-m2m-interaction-with-fine-grained-authorization.md).

# Use case: M2M interaction (with fine-grained authorisation)

This use case showcases iSHARE Trust Framework's key functionality, '[support Machine to Machine (M2M) interaction](/main-aspects-of-the-ishare-trust-framework/key-functionality/support-machine-to-machine-m2m-interaction.md)'.

The example described in the linked chapter is as follows:

* Every day, the ERP system (machine) of Party A requests a status update from the ERP system (machine) of Party B. Party B's ERP system automatically responds with the requested status update. No humans are needed to interfere.

To showcase the key functionality '[facilitate flexible authorisations](/main-aspects-of-the-ishare-trust-framework/key-functionality/facilitate-flexible-authorizations-applicable-in-any-context.md)', Party A's ERP system (machine) is ONLY allowed to request status updates concerning line X of bill of lading Y. This can be considered a fine-grained authorisation.

The following explains this example in detail, utilising the iSHARE Trust Framework.

### Roles and Relations <a href="#usecase-m2minteraction-withfine-grainedauthorization-rolesandrelations" id="usecase-m2minteraction-withfine-grainedauthorization-rolesandrelations"></a>

The following roles are fulfilled in this use case:

* Party A requests a status update, so it is the participant fulfilling the **Service Consumer role**.
* Party B responds with the status update, so it is the participant fulfilling the **Service Provider role**.
* No delegation takes place, so Party A also fulfils the **Entitled Party role**.
* As this is an M2M use case, a **Machine Service Consumer** represents Party A.

The only **legal relation** is the mandatory relation between the Entitled Party (Party A) and the Service Provider (Party B), which establishes the entitlements of the Entitled Party (Party A). As depicted:

<figure><img src="/files/XjxLPw2HWCXGOpI3Ewe1" alt=""><figcaption></figcaption></figure>

### Prerequisites <a href="#usecase-m2minteraction-withfine-grainedauthorization-prerequisites" id="usecase-m2minteraction-withfine-grainedauthorization-prerequisites"></a>

It is a prerequisite of this use case that:

* **\[Classical JWT]:**
  * The Service Provider (Party B) has and manages its own entitlement information indicating what Entitled Parties are entitled to what (parts of) services, i.e. Party B has information indicating that Party A is allowed to request status updates concerning line X of bill of lading Y from its ERP system;
  * The Service Consumer (Party A) can authenticate the Service Provider (Party B);
  * The Service Provider (Party B) can authenticate the Service Consumer (Party A).
* **\[VC Variant]**:
  * Service Consumer (Party A) and Service Provider (Party B) have been issued a ParticipantCredential once onboarded into dataspace;
  * Service Consumer (Party A) has been issued a DataRights Credential from the Entitled Party (in this case Party A);
  * Service Provider (Party B) can verify Service Consumer's (Party A) Verifiable Credential/Presentation and viceversa.

### Use case <a href="#usecase-m2minteraction-withfine-grainedauthorization-usecase" id="usecase-m2minteraction-withfine-grainedauthorization-usecase"></a>

The use case consists of the following steps:

1. The Machine Service Consumer (of Party A) requests a service from the Service Provider (Party B);
2. The Service Provider (Party B) authenticates the Machine Service Consumer (of Party A) and validates the iSHARE adherence of the Service Consumer (Party A);
3. The Service Provider (Party B) authorises the Machine Service Consumer of the Service Consumer (Party A) based on the entitlement information registered with the Service Provider (Party B);
4. The Service Provider (Party B) executes the requested service;
5. The Service Provider (Party B) provides the service result to the Machine Service Consumer (of Party A).

As depicted:

<figure><img src="/files/8QBlP83mvbiNfJX1JRnp" alt=""><figcaption></figcaption></figure>

Note that this use case is the same as primary use case 1, as found under [detailed Functional descriptions](/detailed-descriptions/functional.md).

### Sequence diagram <a href="#usecase-m2minteraction-withfine-grainedauthorization-sequencediagram" id="usecase-m2minteraction-withfine-grainedauthorization-sequencediagram"></a>

<figure><img src="/files/RWjbSDyVj5UfXA39QVVr" alt=""><figcaption></figcaption></figure>

{% hint style="info" %}
**\[VC Variant]:** Authentication and Validation of iSHARE adherence is made through ParticipantCredential verification
{% endhint %}

What needs to be implemented technically for this use case is described [generically](/detailed-descriptions/technical/technical-standards.md), and specifically per role in the [iSHARE Developer Portal](https://dev.ishare.eu/).


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