Hey there, Allkleen. I'll share some information about sending a request for payment via ACH from the original invoice in QuickBooks Online.
The option to enable automatic payment is limited to fixed total amounts. As the invoice amount varies weekly, you can create a scheduled reminder, manually use it, and send it to your clients every week instead.
Here's how:
Click on the Gear icon and choose Account and settings.
Navigate to the Sales tab.
In the Reminders section, click on Edit ✎.
Turn on the Automatic invoice reminders feature.
Toggle the switch for Reminder 1 to enable it.
From the dropdown fields, select days and before or after to tell QuickBooks when to send the reminder. Note: You can schedule and send email reminders up to 90 days before or after the invoice due date.
Feel free to create additional reminders if needed.
In addition, you can check these resources for future reference as your guide: