Looking to change my invoice number I am using the app on my iPhone.
Here's how you can change the invoice number through your iPhone:
If you're unable to change the invoice number, it means that the Custom transaction numbers function wasn't enabled. You'll need to access your account on a browser and turn on the function.
After that, you should be able to change the invoice numbers when accessing your account on the iPhone.
Let me know if you need more assistance with this.