Hi. I wanna ask that when I am sending invoice to customer and customer opened it to pay. But there was no option on invoice to pay. It seems ask sender how to pay.

I know why your customers can't see the option to pay the invoice in QuickBooks Online (QBO), Muhammad. I'll share the details below.

With QuickBooks Payments, you can send invoices so customers can pay online. However, if your customer don't see Pay Now in their email, we can check your invoice settings to ensure the online payments are enabled.  

Here's how:

1. Go to the Gear icon and click Account and Settings under Your Company.
2. Select Sales from the left menu.
3. Look for Invoice payments and make sure the online payments are enabled.
4. Click Save, then Done.

To learn more about managing invoices in QuickBooks, you can refer to these articles: 

• Record invoice payments in QuickBooks Online
• Send invoice reminders automatically or manually in QuickBooks Online

I'll be right here to keep supporting you regarding invoice payments. The Community forum is always available to help you.