Vendor Bill Approval Routing Process
My company uses Xero for our financials, but one big issue we have found is within the approval process. There is no notifications, multi-level approvals, or approval routing. This is quite frustrating, see these conversations in the Xero Community:
https://community.xero.com/business/discussion/102951/
https://community.xero.com/business/discussion/3397219/
https://community.xero.com/business/discussion/2715951/
https://community.xero.com/business/discussion/4193366/
https://community.xero.com/business/discussion/4484747/
https://community.xero.com/business/discussion/5699562/
https://community.xero.com/business/discussion/6475558/
https://community.xero.com/business/question/102951
As you can see this is a big functionality gap with many requests.
Ideally, the Accounts Payable associate would create a Vendor Bill in Xero, the API & external application would route the Vendor Bill for approval (according to some workflow rules), and upon approval (Webapp, Mobile app, email, etc) from the managers, the API would update the Vendor Bill to Approved status in Xero.
Ideally, Xero would build this into the application itself, but without this, I hope this is an opportunity for a external application to create this functionality. I would definitely pay for this.

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Ben commented
Another less expensive option if you don't need as much functionality is www.approvaldonkey.com
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alan commented
Have you looked at ApprovalMax? We are about to give it a try.