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For most cards, regular usage and paying more than the minimum every month.
Use the card so heavily that you have to pay it off in between statement dates in order to spend more than your limit would allow.
@bribro wrote:Use the card so heavily that you have to pay it off in between statement dates in order to spend more than your limit would allow.
I don't know how deeply they analyze, but presumably they want to give CLIs to profitable customers. So I would guess at least some of this heavy spend should be in "normal", not bonus, categories.