# Offer an OCN Service

An OCN Service Provider develops and provides OCN services that can be used by CPOs, eMSPs and other parties to improve their charging services - such as contracting, billing, payment systems etc. 

**The OCN Service is - similar to any other OCPI role - an OCN Party.** We make this distinction from other "Services" that might only require customers to send OCPI messages (including custom OCPI modules) directly. 

### Offer your OCN Service

To offer your OCN Service via the OCN Service Interface, make sure the following prerequisites are met:

1. [The OCN Service has a OCN Identity](https://docs.energyweb.org/legacy-documentation/solutions-2023/open-charging-network/create-and-manage-an-ocn-identity)
2. [The OCN Service is connected to the OCN](https://docs.energyweb.org/legacy-documentation/solutions-2023/open-charging-network/connect-an-ocpi-ocn-party-to-a-node)

**Now you are ready to publish your OCN Service on the OCN Registry.**

### **Set Service Permissions**

An OCN Service is an OCPI party that requires additional permissions from their customers. Such permissions could include the forwarding of session or charge detail record data, for example in a payment service. 

Once a customer/user has agreed to the Service's permissions, the OCN Node tied to the customer will automate any such required permissions, lessening the cost of integration with a service. 

**To be granted the aforementioned permissions, you must then list your OCN Service and the permissions required in a separate smart contract, entitled "Permissions"**. Thereafter, a user can make their agreement explicit in the same smart contract. Learn more on how to list your OCN Service on our [OCN Registry Repository](https://github.com/energywebfoundation/ocn-registry).

You can find a full list of currently implemented OCN Permissions [here](https://github.com/energywebfoundation/ocn-registry/tree/develop).

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Access the full OCN technical documentation [here](https://shareandcharge.com/wp-content/uploads/2020/11/OCN-Documentation-v1.1.pdf).
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