If you have an issue with a charge on your credit card, please do not read this page. This program is for software researchers, and our engineering team cannot access donor information such as credit cards and cannot refund charges. If you are looking at this page because you want to cancel a contribution, please contact our customer service team at or by using the contact form.

We’re committed to working with the developer and security communities to identify any vulnerabilities and ensure that our platform is as safe as can be.

If you want to bring a technical issue to the attention of our software security team, send an email to GPG-signed mail is preferred; you may use our public key to encrypt any potentially sensitive information. We'll try to respond within 2 business days.