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The main and the most important config is the proxy_conf.yaml located in the root folder of the application. The example configuration can be found in the SaToSa docs. The most important parts that will need be customized are the configs listed under BACKEND_MODULES and FRONTEND_MODULES. These are file paths (there can be multiple of each) leading to the configs of individual SPs/RPs and IdPs/OPs. The proxy_conf.yaml always has the same name and location. The individual configs of IdPs/SPs can technically have different paths and names and formats depending on the configuration of the given implementation.