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Notes from the bridge
Point your QuickBooks Online integration at QuickBooks Desktop
The whole migration is a base URL. Here's the full walkthrough — token, query, and invoice write — against a real Desktop company file.
QuickBooks Desktop errors don't have to be cryptic
How TenkeyBridge turns Desktop's 3140s and 0x8004-somethings into QBO faults with causes, fixes, and a docs link on every error.