Fraud liability for in person credit card transactions via ShopifyPOS?

[adamnyc31]

I have a few questions regarding face-to-face card-present transactions that are from in-store retail customers making purchases with a physical credit card. I’m looking to confirm the correct procedures and better understand the associated risks.

I accept credit cards cards in person using the Shopify GO EMV-compliant reader, and I never swipe magnetic stripes. All transactions are processed either via 'tap' or 'chip insert' through Shopify Payments.

1.) Regarding liability, provided I use this EMV-compliant card reader and either insert or tap the physical card, am I protected against losses from claims of fraudulent purchases?

2. ) Are there any transaction limits I should be aware of? I regularly process single transactions in the $3,000 to $6,000 range.

3.) Is there any difference in liability between a 'tap' vs 'chip insert' transaction? Is one method considered safer or less risky than the other?

4.) If we suspect fraud, is there a number we can call to verify the card before processing the transaction?

5.) Lastly, is there anything else I can do to detect or prevent fraudulent card-present face-to-face transactions?

Thank you for your assistance.

I looked at most of the Shopify documentation but could not find anything related to this.