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1. Back up the databases in your API Manager instances and synapse configs in of all the tenants, including the super tenant.
   You find the synapse configs in <APIM_1.8.0_HOME>/repository/deployment/server/synapse-config/default. For the synapse configurations of tenants, look in <APIM_1.8.0_HOME>/repository/tenants/<tenant_id>/deployment/server/synapse-config/default. 
   If you use a clustered/distributed API Manager setup, back up the configs in the API Gateway node.

2. Download the API Manager 1.9.0 from http://wso2.com/products/api-manager/.

3. Open the <APIM_1.9.0_HOME>/repository/conf/datasources/master-datasources.xml file and provide the datasource configurations for the following databases. You can copy the configurations from the same file in the API Manager 1.8.0 instance.

   • User Store
   • Registry database
   • API Manager Databases

4. Edit the registry configurations in the <APIM_1.9.0_HOME>/repository/config/registry.xml and the user database in the <APIM_1.9.0_HOME>/repository/conf/user-mgt.xml file.

5. Move all your synapse configurations by copying and replacing the files inside <APIM_1.8.0_HOME>/repository/deployment/server/synapse-config/default directory to <APIM_1.9.0_HOME>/repository/deployment/server/synapse-config/default directory.

   Warning

   Do not replace the the _TokenAPI_.xml, _RevokeAPI_.xml and _AuthorizeAPI_.xml files in the /default/api sub directory unless you use a custom token endpoint. They are application-specific APIs. Do not delete the the <APIM_HOME>/repository/deployment/server/synapse-configs/default/sequences/_cors_request_handler.xml file, which is introduced in the API Manager 1.9.0 version. This file contains the default mediation sequence configurations.

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