[Canada] Taxi won’t take cash scam?

I was pushing my shopping cart back to my car at a well known retailer in Canada. I was approached by a young woman who asked if I could help her.

She told me that she called a cab, but the cab doesn’t take cash and that she would give me her cash of if I paid the driver.

Of course my scam-meter was high. You can’t legally refuse cash here unless you cannot make change. She had a $20 in her hand.

I’m thinking she was in cahoots with the taxi driver to basically get my credit card info.

There was a taxi in front of the store, but not one of the two companies who are 90% of the volume in our city. Besides her generation orders Rideshare companies, not taxis.