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You can link two (or more) Invision Community installations together to allow users to sign into one community using their credentials from another. All communities that you want to link will need to be running Invision Community 4.3 or higher.
Server and Client
You will need to decide which community is the "Server" (sometimes called the "master") which is the one whose credentials will be used for the login. All the other communities will be the "Clients" (sometimes called the "slaves").
Step One: Set up the Server
On the community which will be the Server, go to AdminCP -> System -> REST & OAuth, and click the "Create New" button to create a new OAuth client. For the client type, choose "Another Invision Community".
Setting up the Server
After saving this form, you will see a Client Identifier and Client Secret. You will use these two values to fill out the form on the Client community.
Getting the Client Identifier and Client Secret
Step Two: Set up the Client
Now on the community which will be the Client(s) go to AdminCP -> System -> Login & Registration, click "Create New" and choose the "Another Invision Community". You will need the Client Identifier and Client Secret from Step One.
Setting up the Client
Once you have saved this form, set up is complete and should be able to log in!
Need more communities?
If you are setting up more than two communities, run through this process for each of the Client communities.
Server and Client
You will need to decide which community is the "Server" (sometimes called the "master") which is the one whose credentials will be used for the login. All the other communities will be the "Clients" (sometimes called the "slaves").
Step One: Set up the Server
On the community which will be the Server, go to AdminCP -> System -> REST & OAuth, and click the "Create New" button to create a new OAuth client. For the client type, choose "Another Invision Community".

Setting up the Server
After saving this form, you will see a Client Identifier and Client Secret. You will use these two values to fill out the form on the Client community.

Getting the Client Identifier and Client Secret
Step Two: Set up the Client
Now on the community which will be the Client(s) go to AdminCP -> System -> Login & Registration, click "Create New" and choose the "Another Invision Community". You will need the Client Identifier and Client Secret from Step One.

Setting up the Client
Once you have saved this form, set up is complete and should be able to log in!
Need more communities?
If you are setting up more than two communities, run through this process for each of the Client communities.