Add Usesend but havent tested it just yet

packages/backend/convex/custom/auth/password/reset.ts

@@ -0,0 +1,28 @@
+import { Usesend } from '..';
+import { UseSend } from 'usesend-js';
+import { generateRandomString, RandomReader } from '@oslojs/crypto/random';
+
+export const UsesendOTPPasswordReset = Usesend({
+  id: 'unsend-otp',
+  apiKey: process.env.AUTH_USESEND_API_KEY,
+  async generateVerificationToken() {
+    const random: RandomReader = {
+      read(bytes) {
+        crypto.getRandomValues(bytes);
+      },
+    };
+    const alphabet = '0123456789';
+    const length = 8;
+    return generateRandomString(random, alphabet, length);
+  },
+  async sendVerificationRequest({ identifier: email, provider, token }) {
+    const useSend = new UseSend(provider.apiKey, 'https://usesend.gbrown.org');
+    const { error } = await useSend.emails.send({
+      to: [email],
+      from: provider.from ?? 'TechTracker Admin <admin@mail.techtracker.gbrown.org>',
+      subject: `Reset your password - TechTracker`,
+      text: `Your password reset code is ${token}`,
+    });
+    if (error) throw new Error("Usesend error: " + error.message)
+  },
+});