How to Issue Bulk Refunds through the Stripe API
Dec 10 2014

Today was not a good day. In short, a nonprofit's online donation form was hit 1,285 times in an attempt to validate stolen credit cards. Unfortunately, 120 of those succeeded, meaning our Stripe account had over $600 in fraudulent donations. I needed a quick way to fully refund those charges, but in bulk. Through the Java API client, I was able to do the following. I figured I'd throw it out here, in case someone else can use it. Note that although it uses the Java client, the concept is identical for others.

import com.stripe.Stripe;
import com.stripe.model.Charge;
import com.stripe.model.ChargeCollection;

import java.util.HashMap;
import java.util.Map;

public class StripeRefunder {

    public static void main(String[] args) {
        try {
            ////////////////////////////
            // USE YOUR STRIPE KEY HERE.
            Stripe.apiKey = "";
            ////////////////////////////

            int iterationCount = 100;
            String startAfter = null;
            int totalCount = 0;
            while (iterationCount >= 100) {
                ChargeCollection charges = get(startAfter);
                iterationCount = charges.getData().size();
                totalCount += iterationCount;
                startAfter = charges.getData().get(iterationCount - 1).getId();
            }

            System.out.println("TOTAL REFUNDS: " + totalCount);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    private static ChargeCollection get(String startAfter) throws Exception {
        Map<String, Object> params = new HashMap<String, Object>();

        ////////////////////////////////////////////////////////////////////////
        // USE RELEVANT LOGIC HERE.  IN OUR CASE, THE FRAUD CHARGES WERE ALL $5.
        params.put("paid", true);
        params.put("amount", 500);
        ////////////////////////////////////////////////////////////////////////

        params.put("limit", 100);
        if (startAfter != null) {
            params.put("starting_after", startAfter);
        }
        ChargeCollection charges = Charge.all(params);
        for (Charge charge : charges.getData()) {
            charge.refund();
        }
        return charges;
    }
}