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        <title>Documentation</title>
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        <div id="Infos">
            <p> <a href="/">index page</a> | <a href="/list">user and tag list</a></p>
            <p><a href="https://hannover.ccc.de/gitlab/anton/matekasse">https://hannover.ccc.de/gitlab/anton/matekasse</a></p>
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        <h1 class="header"> <u>Documentation</u> </h1>
        
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            <h2>API:</h2>
            <p>http://matekasse.server.c3h/api/tag_id</p>
            <p>Post method "id"= tag id</p>
            <p>Response:
                {"mode":"error" "error":"{error}"} or
                {"mode":"message","username":"{username}","message":"{message}"} or
                {"mode":"balance", "username":"{username}", "balance":"{balance}"}
            </p>
            <br></br>
            <p>http://matekasse.server.c3h/api/balance</p>
            <p>Post method "id" = user id, "change"=change</p>
            <p>
                If change = None or NaN the change will be -1
            </p>
            <p>
            Response:
                {"mode":"error" "error":"{error}"} or
                {"mode":"balance", "username":"{username}", "balance":"{balance}"}
            </p>
            <br></br>
            <h2>Error Codes:</h2>
            <p>170: Tag already in use</p>
            <p>054: Tag does not exists</p>
            <p>757: User already exists</p>
            <p>043: User does not exists</p>
            <p>352: Timeout</p>
            <p>095: Input is not a Number</p>
            <P>418: I'm a teapot</P>
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