For judges, and anyone curious

Try both sides of the stand.

Play the grower and the customer, on the real app. About ten minutes, in PayPal's sandbox: no real money moves.

Reading today at the demo stand…

The sandbox buyer's login is in the testing instructions on Devpost.

grower

You run the stand

  • Set it up in the morning
  • Decide refunds and IOUs
  • See what walked at dusk

No account needed: you sign in as the demo stand's grower.

customer

You buy from it

  • Photograph your basket
  • Pay with PayPal on your phone
  • Claim a refund if charged too much

The day, in four steps

Grower steps on a laptop or phone; customer steps on your own phone, as a customer would.

  1. 1grower

    Open the stand

    Photograph the price card and the shelf, or set the counts with the buttons.

  2. 2customer

    Buy something

    Photograph a basket, check the count, and pay with PayPal as the sandbox buyer.

  3. 3customer

    Ask for a refund

    On the receipt, say you took one fewer. The agent recounts your photo and refunds you itself.

  4. 4grower

    Close the day

    Count what is left. See what sold and what walked, against PayPal's own record.

Behind the counter

As the grower, every page is in the bar: along the bottom on a phone, along the top on a laptop.

Check what we claim

The AI reads, counts and explains. Plain code does every total, refund and gap, and the tests that prove it run on every commit.

The code and READMEHow each eval works

The grower's refund limit on the demo stand is €5.00.