Postmates has various Promo codes for Pi Day. They seem to get more valuable the longer the digits are (max 50 digits). Doesn’t seem to be a limit to the number of codes you can redeem.
Click Enter Promo, paste first 50 digits of PI, click "Add Promo". Click Enter Promo, paste first 49 digits of PI, click "Add Promo". Keep going till you’ve had enough
Codes that worked for me:
$20 off $35: 3.141592653589793238462643383279502884197169
40% off: 3.1415926535897932384626433832
https://twitter.com/Postmates/sta…426697216
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