how to call Square App on IOS using their code? - ios

Sorry but newbie is here. And, I may have not googled hard enough but as I went on searching no one has asked this newbie question yet. I'm really confused how to call Square App.
In this document: https://docs.connect.squareup.com/payments/pos/setup-web#step-1-install-the-square-point-of-sale-app
At the part that say "Initiate a mobile web transaction: iOS"
They tell me to put this line below in a URL format
square-commerce-v1://payment/create?data={REPLACE ME}
But do not say where and what is REPLACE ME suppose to be.
Can some one kindly enough to help me understand this please?

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