<h1><b><span style='font-size:14px;'>Dear</span><span style='font-size:14px;'>  </span></b><span style='font-size:14px;'><b>{contact_name},</b></span></h1><p><span style='font-size:14px;'>Thank you for your purchase! Your invoice number is {invoice_number}.</span></p><p><span style='font-size:14px;'>If you have any questions or concerns, please don't hesitate to reach out to us. We are here to help!</span></p><p><span style='font-size:14px;'>Best regards,</span></p><p><b>{business_name}</b></p>