You can enable the QuickBooks Online (QBO) feature "Automatically send imported invoices," which will email an invoice to your client when it is pushed to QBO from D-Tools Cloud.
To enable this feature:
1/ Log in to QuickBooks Online.
2/ Go to "Settings > Account and settings > Payments."
3. Under Invoice payments, select the "Automatically send imported invoices" checkbox.
4/ Click "Save."

