Hi franklynn,
This is a great question and I'm glad to see that you received an answer to this on the x.com developer forums. I'm responding to this thread with a link to the answer provided on that thread.
https://www.x.com/developers/paypal/forums/basic-website-payments/paypal-add-cart-button-lower-shipping-multiple-items-drop-down-list#answer-218603
- Frank
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