Shalom Rabbi,

In regards of your article about using a credit card, and I asume a debit card on Shabbat.

If on Yom Tov you don’t have an ingredient for food, or you need bread, wine or any other food necessity or even home necessity for human decency (like soap, toilet paper). Can you go to a store and get it with credit/debit card? Can this apply to Shabbat?

This may sound exaggerated, but, even if you carry that product bought with credit/debit on Shabbat in a place with no Eruv, such a product, since it wasn’t affected isn’t forbidden right?

Premade sandwhiches with Kosher ingredients or sushi and food that doesn’t involve a Melakha can be bought on Shabbat/Yom Tov on credit/debit?

In a private place or a place with an Eruv and you walk into a museum, cinema, a tourist place or even a nice beer garden. Can you pay an entrance or order a drink/premade food in the beer garden or restaurant with credit/debit? Both on Shabbat and Yom Tov.