Subject: Thank You - Payment Received for Invoice [INVOICE_NUMBER]

Hi [CLIENT_NAME],

Thank you for your prompt payment of [AMOUNT] for invoice [INVOICE_NUMBER]. I've received and processed your payment.

I really appreciate working with you and look forward to our continued partnership.

If you need anything else or have any questions, please don't hesitate to get in touch.

Best regards,
[YOUR_NAME]
[YOUR_BUSINESS_NAME]
[CONTACT_EMAIL]