API ReferenceAccountingAccountingA portable accounting contact contract across QuickBooks Online, Xero, and Cin7 Core.Copy MarkdownOpenA portable accounting contact contract across QuickBooks Online, Xero, and Cin7 Core. Systems SystemAuthRate limitQuickBooks OnlineOAuth 2.050 req / 6sXeroOAuth 2.01 req / sCin7 CoreAPI key2 req / 3s Entities CustomerPortable accounting customer / contact contract. name is the stable cross-system anchor; currencyCode matters …Time entry · time_entryPortable restaurant labor time-entry / punch-clock contract.Customer · customerPortable accounting customer / contact contract. name is the stable cross-system anchor; currencyCode matters for Cin7 Core writes, and address fields matter most for QuickBooks writes.