Business menu

GnuCash's Business menu mapped to methods - Customers, Vendors, Employees, Jobs, Invoices, Bills, Expense Vouchers, Process Payment, due reminders, Sales Tax Tables and Billing Terms. Find windows are list methods; printing is report.run.

GnuCash's Business menu has a submenu for each kind of Owner. red-ale has the same objects, each with create, get, list and update methods, and a "Find" window is a list method. See Business documents for the model.

Customer

GnuCash	red-ale
Customers Overview	`customer.list`
New Customer...	`customer.create`: ID (from the next counter if you leave it out), name, address, terms, tax settings, credit limit. Edit with `customer.update`; `customer.get` reads one
Find Customer...	`customer.list`, filtered by you
New Invoice...	`invoice.create` for the Customer, then `invoice.addEntry` for each line. Make a credit note with `creditNote: true`
Edit Invoice	`invoice.update`, `invoice.updateEntry` and `invoice.removeEntry`, while it is unposted. `invoice.totals` gives the subtotal, tax and total
Post (in the invoice window)	`invoice.post`: the A/Receivable Account, the posting date, an optional due date
Unpost	`invoice.unpost`
Duplicate Invoice	`invoice.duplicate`
Find Invoice...	`invoice.list`
New Job..., Find Job...	`job.create`, `job.list`
Process Payment...	`payment.openItems` lists what can be paid, then `payment.process`; one document: `invoice.pay`
Invoices Due Reminder	`invoice.due`

Vendor

GnuCash	red-ale
Vendors Overview, Find Vendor...	`vendor.list`, `vendor.get`
New Vendor...	`vendor.create`, `vendor.update`
New Bill..., Find Bill...	`invoice.create` for the Vendor, `invoice.list`. Everything above for invoices applies to bills; post to an A/Payable Account
New Job..., Find Job...	`job.create`, `job.list`
Process Payment...	`payment.process`
Bills Due Reminder	`invoice.due`

Employee

GnuCash	red-ale
Employees Overview, Find Employee...	`employee.list`, `employee.get`
New Employee...	`employee.create`, `employee.update`
New Expense Voucher..., Find Expense Voucher...	`invoice.create` for the Employee, `invoice.list`
Process Payment...	`payment.process`

GnuCash	red-ale
Sales Tax Table	`taxTable.create`, `.get`, `.list`, `.update` and `.delete`. A table in use cannot be deleted
Billing Terms Editor	`billTerm.create`, `.get`, `.list`, `.update` and `.delete`
Business Linked Documents	`docLink.documents`
Orders	`order.create`, `order.addEntry`, `order.close` and the rest of `order.*`
File > Properties > Counters tab	`counter.list`, `counter.set`
File > Properties > Business tab	`book.options`, `book.setOptions`: the company details, the default invoice report

Printing an invoice

GnuCash's File > Print Invoice runs the Book's Default Invoice Report for the document, falling back to the Printable Invoice when that setting is not an invoice report. In red-ale that is report.run (or report.export for HTML) with the invoice report and its Invoice Number option set to the document's GUID:

Read defaultInvoiceReport from book.options.
If it names an invoice report red-ale has, run that. If it is empty, or names one red-ale does not have (the Easy or Fancy Invoice, say), run the Printable Invoice, as GnuCash falls back to it.
Pass {"General": {"Invoice Number": "<guid>"}} as options.

The company details printed on it are the book's Business options. The Easy, Fancy, Tax and Australian Tax invoices and the Receipt are not ported; see Reports menu.

What is not here

GnuCash has no payroll system and neither has red-ale. The customer, vendor, employee and job reports, aging reports and the Customer Summary are not ported: write them as User reports.