Thank you for reaching out to the Community! The universal code is specifically provided when using our Inline Sign Up Form to add to your website. This allows contacts to sign up on your website and be automatically added into your account.
When connecting your Shopify account, you do not need a universal code. You can click here for instructions on connecting your Shopify account, and here for adding products within your email campaigns.
I hope this information helps! In the meantime, if you have any further questions please feel free to reach out to us here. We are always happy to assist you in any way we can!
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