FreshBooks

Start connecting your FreshBooks account(s): register your FreshBooks app's Client ID/Client Secret, then get back a one-time browser authorize_url. Open it, sign in with FreshBooks, pick the business(es) to grant access to, and approve -- FreshBooks redirects back here automatically and the connection finishes itself, no further action needed.

List the connected FreshBooks accounts.

Disconnect a FreshBooks connection: deletes the saved connection (and every account it covered). Nothing in FreshBooks itself is changed.

List FreshBooks records of any resource type (clients, invoices, expenses, estimates, items, payments, taxes, staffs) in the connected FreshBooks account.

Read one FreshBooks record of any resource type in full by its id.

Create a new FreshBooks record of any writable resource type (clients, invoices, expenses, estimates, items) from a JSON object of its fields.

Update selected fields of an existing FreshBooks record. Only given fields change.

Permanently delete a FreshBooks record (invoices, expenses, estimates, items). FreshBooks marks most records as 'deleted' rather than removing them outright, but this is not reversible through the API.

Value-add report: scan recent FreshBooks invoices and summarize total invoiced/paid/outstanding amounts, broken down by status.

Value-add report: flag every unpaid FreshBooks invoice overdue by at least a given number of days.