Hi there troyw1,
Thanks for reaching out about paying your supplier. QuickBooks Online is a great tool able to help you create cheques so that you can pay your suppliers. I can provide some information about supplier payments.
As mentioned by Chrea, there isn't the option to electronically pay your suppliers directly from QuickBooks Online. I can see that this would be a feature that you'd like to see added to QuickBooks Online. I recommend leaving feedback in the system of your QuickBooks account by clicking on the Gear Icon, then Feedback, as the comments made in that section are considered by the developers for future updates of the program.
If you have any other questions feel free to reach out here.