Sharepoint - Approval workflow question

Hi experts,
I'm looking to build an approval workflow that can help with our wire transfer process. Not sure if Sharepoint (our firm's on Office 365 Sharepoint online) can do this relatively easily, but here's what I'm looking for:

1. Accounts payable admin enters the details of the payment - Amount, Vendor, Wire details, etc.
2. Accounts payable admin chooses the approvers (with order of approvals, preferably)
3. Email's automatically sent to the approvers right away and they choose yay or nay
4. if it's approved, here's where it gets better... I need to somehow have Sharepoint generate a csv or xlsx (using the info entered in step #1) in a specific format so that accounts payable admin can upload it to the bank to initiate the transfer.

I have a good grasp of C# and SQL if these skills are useful for developing Sharepoint to do this.

If you know of a solid alternative system to tackle these needs, I'm all ears as well.

Thanks in advance