Where can I find real-time indicators of economic activity? In this paper, they are using Canadian debit card dataset. I am not sure where to get such a dataset.

http://www.cirano.qc.ca/pdf/publication/2009s-23.pdf

My broad question is what kind of indicator can I use that indicates real-time economic activity of the people? Something that indicates how much people are buying on an hourly basis for an example. I am willing to look at unconventional datasets or willing to scrape information from scratch.

I thought about using Amazon review timestamps for example, but I know want to when people are buying something. Specially over the United States or smaller.
The projects developed by Alberto Cavallo and Roberto Rigobon could be a source of inspiation.

The Billion Prices Project is an academic initiative that uses prices collected from hundreds of online retailers around the world on a daily basis to conduct economic research. This page shows their most recent research leveraging high-frequency price data, as well as the US daily inflation index (updated monthly).

Here are the datasets on Online Micro Price Data, Global Retailers Data...