We need a Invoice to make payment, also need to update email ID

Hello there, userramya.

If you're referring to the subscription invoice, QuickBooks Online sends it to the master administrator's email every month. To get a copy of the invoice, I'd recommend contacting our Customer Care Team. They can pull up your account and provide the details.

Here's how:

1. Sign in to your QuickBooks Online account, go to the Help > QB Assistant.
2. Type Talk to a human and select either Ask me a question or Contact Support Team.

Once your payment is successful, you can check the billing history in QuickBooks. I have this article that includes the step by step instructions: View your QuickBooks Online payment history.

With regard to your other concern, you can update the email address by following these steps:

1. In your QuickBooks Online account, click the icon beside the Gear located in the upper right-hand corner.
2. Click the Manage your Intuit Account link.
3. On the left panel, select Sign in & Security.
4. Go to the Email address section and modify the information.
5. Click Save.

Please see this sample screenshot for a visual guide:

You can read this article for reference: Change the email address you use to sign in.

Please stay in touch with me if there's anything else I can help you with. Thank you!