How to setup ACH payment option to receive invoice payment? I have already tried for payment methods but there is no ACH option.

The option to process customer payments using ACH payment in QuickBooks Online UK is unavailable, @muhammadhssan200.

In the UK version, you can accept electronic payments such as direct debit and PayPal directly from an invoice. You can also use GoCardless for recurring invoices and direct debit payments.

Meanwhile, you'll want to consider looking for a third-party application that you can integrate with the program. 

To find the right app for your business, hover to the Apps menu in your QBO account. You can browse the available apps and select one that meets your requirements for processing customer payments.

I've included these articles on setting up GoCardless and entering your bank account as well:

• Get Started with GoCardless
• Accept Card Payments with PayPal App FAQ

Additionally, you can refer to these articles for future reference:

• Record Invoice Payments in QuickBooks Online
• Take and Process Payments in QuickBooks Online

If you have any further questions about processing payments, feel free to reply to this thread. I'm here to assist you.

@muhammadhssan200 

If you run a service company, consider having a proposal management app to sync with QBO and accept ACH payments.