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Steps to follow for migrating to SDK 2

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Step 1

Replace the Mindset SDK 1.0 file name mindset-sdk.js by mindset-sdk-2.js The MINDSET-SDK-URL is also a new URL (not anymore your mindset AI app URL). 
<script src="MINDSET-SDK-URL/mindset-sdk2.js"></script>
Replace MINDSET-SDK-URL with the URL provided by Mindset AI.

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Step 2

Add the <mindset-agent> HTML tag in your HTML body 
<mindset-agent 
    agentUid='YOUR-AGENT-UID'
    style='width: 100%; height: 600px; display: block; background-color: rgb(255, 255, 255);">
</mindset-agent>

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Step 3

Remove the javascript code that uses the SDK 1.0 methods (initApp() and render() or startAgentThread()). Your existing script should look like this: 
mindset.initApp({ 
    appUid: "YOUR-APP-UID", 
    authToken: data.authToken,     
    containerId: "agent-div",      
    loadingText: "Please wait ..." 
})

mindset.startAgentThread({
    agentUid: "YOUR-AGENT-UID",  
    initialQuestion: "Some text to send to the agent"
});

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Step 4

Wrap your existing code in charge of fetching the authToken from your back-end script into an async method: 
<script>
    async function getAuthToken() {
        const currentUserId = 'session123'
        const userAuthTokenServerUrl = `YOUR-BACKEND-API-RETURNING-AUTHTOKEN`
        // e.g. https://mycompany-backend/api/getusertoken/${currentUserId}

        try {
            const headers = {
                "accept": "application/json",
                "Content-Type": "application/json"
            };
            const response = await fetch(userAuthTokenServerUrl, {
                method: 'POST',
                headers: headers,
                body: JSON.stringify({"currentUserId": `${currentUserId}`})
            });
            if (!response.ok) {
                throw new Error(`HTTP error! status: ${response.status}`);
            }
            const responseData = await response.json();
            return responseData.authToken;
        } catch (error) {
            console.log('Error fetching auth token:', error);
            throw error;
        }
    }
</script>

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Step 5

Pass your function to the mindset.init() method 
<script>
    mindset.init({fetchAuthentication: getAuthToken, appUid: "YOUR-APP-UID"})
</script>
Please check a full example of a SDK 2 front-end page here : Front-end full example