I recall merchants taking a pencil and adding up one's purchases on the paper bag that they were put in. All cash. You put your payment on the counter; your change was also put on the counter, so you could inspect it.
That was still the norm in Europe, last time I was there (1988....cash on the counter, not the scribbling on kraft paper).
Charge cards used to be called charge plates.
They were made of aluminum, of the same dimensions as today's cards. They were issued to customers of the old-line department stores, as a matter of convenience. There were no carrying charges, because they were not credit accounts. When the bill arrived, the bill was paid in full. Few folks would get themselves in debt if they could avoid it then. You would incur interest for furniture, a vehicle, a house, large repair bills, but that was pretty much it.
How things have changed.
In Buffalo, shopping downtown used to be THE thing. You would usually take the bus (car ownership was less, plus why bother hunting for parking?). You would transact, and your goods were delivered. Some might recall the brown delivery trucks of the Downtown Merchant's Association. Some might recall the ads in the Buffalo Evening News and the Courier-Express, the illustrations of goods for sale by graphic artists.
Those were jobs. The graphic drawings, the deliveries, etc. employed folks. People wring their hands about this or that Administration. The march of technology has cut more livelihoods than any governmental regime could ever do. Of course, their appetite for taxation stuck in the final knife...