Stop asking people for Slack IDs! Send someone to https://slack-id.hackclub.com/?return_to=<URL> and they'll be redirected to your form with their Slack ID prefilled.
-----BEGIN PUBLIC KEY-----
MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAt8PEjlMVexLnZyul55nu
sDHuDYL/6rCfrOOX1UK0ZNoEnVRBhArEyCBkPNxXikGIHY4Esxuqx5onu1zOooji
9YoghuvIylyXOHToubt/OiY5UUqPr3tyz1Ng/4woGyYnqdtQvBBvutodg6Ewjy/W
OzZeqYCfHZloOGf4uZ/Vdqm/r5x4MBGGHnRAMlQq7UX2zgC6XSAwi0MpoI2Qgl9j
J5QRuN2IEtOxGrEOtTXMcv20hDDIqO0lFzr4Smp87LgnF6ONaWxNuTEZ3VODjI6Y
l3i8XwcLSg9zjCu9Fn2qNLZ4r3oZfuMnEJjpBDNFMK87tu+TveCiEuf83mZtdRkP
eQIDAQAB
-----END PUBLIC KEY-----