Hi naina_tahilraman,
Welcome to Community! Having the ability to send automated payment reminders is a great way to ensure you're paid on time. QuickBooks Online has the features you need to make this possible. I'll be happy to show you how!
You can send a reminder to your customers for their invoices by following these steps:
1. From the Gear ⚙, select Account and settings
2. Open the Sales tab
3. In the Reminders section, select the Edit ✏️
4. Turn on Automatic invoice reminders.
5. Click on the ▼ dropdown for Reminder 1, and turn the toggle to on
6. From the dropdown fields, select days, and before or after to tell QuickBooks when to send the reminder. Note: You can schedule and send email reminders up to 90 days before or after the invoice due date.
7. You can create additional reminders as needed.
Here's a helpful article for sending invoice reminders in QuickBooks Online.
Please feel free to reach back out with other questions. We'd be glad to help!