aliexpress,taobao,ebay,amazon-stores,paypal button,bitcoin,square in a busy location. lots of competition on the ad-hoc sale tip. tightly coupling this with a p

aliexpress,taobao,ebay,amazon-stores,paypal button,bitcoin,square in a busy location. lots of competition on the ad-hoc sale tip. tightly coupling this with a particular kind of item is not my cup of tea either