Credit card or prepaid card — Block, Inc. (CO)

Privacy issues. A month ago I visited a friend in another state, and he ordered food to-go online from a restaurant 's webpage. When we arrived, I used my credit card to pay for the food using the restaurant 's SQUARE payment terminal/register. A few weeks later after I returned to Colorado my friend emailed me asking whether I had a credit card ending in XXXX. I said yes but why. Then my friend told me he had been receiving numerous emails for the last few weeks of all of my transactions at SQUARE payment terminals in coffeeshops, bakeries, etc. I called my credit card company and said they didn't have my friend 's email listed on my credit card. At no time had I given SQUARE my friend 's email address, nor had I given them permission to email me, or him my receipts. In fact I a