It seems to code as regular Instacart and triggers the credit, I did it through PayPal most recently but assuming it codes the same directly with a credit card. PayPal says that the payment was sent to "help@instacart.com".
Nice, thanks for the input. That's cool that paypal worked. It's usually the opposite. Paypal usually kills the deal when trying to trigger an offer.
Especially with amex offers and the chase offers you save to your card. You need to use the physical card.
$15 from CSR, $15 from Costco same day, and $20 from Instacrt GC. On a $115 purchase which is what's needed that's like 43% off. Not to bad.