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After getting the custom app's API access token and API key, access the Magestore POS URL: <link>. http://admin.pos.magestore.com/
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In the Create an Account page, fill in all required fields
Store namename: this is the prefix of your Shopify URL, in front of the .myshopify.com
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Username: fill in an easy-to-remember username for login to both POS Admin and POS Checkout.
Password and Password confirmation: fill in at least 7 characters for passwords, with both numeric and alphabetical ones
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Once you enter valid content, click on the Sign-Up button to move to the Shopify Integration page.
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