RubeWeb.Router.Helpers.token_url

You're seeing just the function token_url, go back to RubeWeb.Router.Helpers module for more information.
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token_url(conn_or_endpoint, action)

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token_url(conn_or_endpoint, action, params)

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token_url(conn_or_endpoint, action, blockchain_id, address)

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token_url(conn_or_endpoint, action, blockchain_id, address, params)