Hi @Biscuitjava2023,
Thank you for your post and welcome to the PayPal Community Forum! Newly integrating PayPal with your Shopify store is exciting and I'm happy to have the chance to direct you for getting it started!
Enabling Reference Transactions is a setting that must be manually changed by a PayPal Customer Service representative. Please follow that link to find your options for contact.
I hope this is quickly adjusted for you so you can get started!
Olivia
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