Hi, I am Tay and working on Spend data analysis for academic purpose.
This post https://community.deweydata.io/t/safegraphs-data-sourcing-process/13546 was very useful to deepen my understanding on SafeGraph.
However it does not cover sourcing process of Spend Data. Can anyone describe how the data is collected? I assume that most of transaction might be collected via card payment system whilst still wondering the reason why major brand stores (e.g., Starbucks, McDonalds’) which are usually equipped with credit/debt card payment system at POS are covered in limited proportion.(I found the number of respective Starbucks stores in 2019 dataset takes appx 50% of total store counts in the U.S. then)