I am wondering if there is a way for PayPal Smart Payment Buttons to accept postcodes in lower case? If not is there a way to add a hint or something to tell the user that it needs to be in capital letters?
I have omitted the first part of the postcode in the below screenshots but you can see the difference when it isn't working
Thanks for the screenshots for clarification. Unfortunately, the postal code is case sensitive here. There isn't really a way to modify that in-context form for Smart Payments Buttons but you could add a hint to the side or above it to ensure customers are clear on that. Our teams are always working to improve the SPBs so I can definitely pass this tip along to them for a potential improvement!