No, it is not mandatory to put each letter in caps, letters can be used in mixed case as well.
A Promo code can be entered is all caps as well as mixed case in order for it to work. it will be valid as long as the correct letters and numbers are present regardless of case.
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This additional disclaimer will be removed upon formal review of this article. The standard Punchh Inc. KB Disclaimer still applies, and can be found at: https://support.punchh.com/hc/en-us/articles/360040100273-Punchh-Inc-Knowledge-Base-Disclaimer
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