# Letter of Authorization for CORSIA

As required in the Rainbow Double counting policy, Project Developers seeking to obtain the CORSIA  eligibility on Rainbow Carbon Credits must provide an official Letter of Authorisation from the Host Country.

:point\_right: Download the template [here](https://docs.google.com/document/d/1S8CQchqWLr7scckxJM5_VlEAQpkISomROklqjLaVoDs/edit?usp=sharing).

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