Carbon

Accounting

Post invoices to Xero and keep currency exchange rates current automatically.

Two accounting integrations: Xero mirrors your into an external ledger, and Exchange Rates keeps multi-currency math honest. Exchange Rates is available on every plan; Xero is an Enterprise (Business-plan) integration.

Xero

Paid

Connect over OAuth, then choose what Carbon and Xero share. Once connected, Carbon posts sales and purchase invoices to Xero and keeps the two ledgers aligned.

Connect over OAuth

No keys to paste. Authorizing stores the connection.

Choose what's shared

Set backfill, the per-entity source of truth, and the default account mapping (below).

Run the initial sync

A Run Initial Sync action kicks off the first backfill on demand. After that, changes flow continuously, matched to the same Xero record each time so a Carbon customer or invoice never duplicates.

FieldType
Whether to seed Xero with your existing customers, vendors, and items on first connect.
Per entity (customer, vendor, item, invoice, bill): whether Carbon or the accounting system wins on conflict.
The default sales and purchase account codes, picked from your Xero chart of accounts.
HEADS UP

Xero only appears when its OAuth client is configured server-side (XERO_CLIENT_ID). Without it the integration is hidden — see Environment variables.

Exchange rates

Turn it on and it runs — no fields to configure. Carbon refreshes currency exchange rates daily so foreign-currency documents convert against current rates. Exchange Rates is available on every plan.

NOTE

On Carbon Cloud the rates come from exchangeratesapi.io by default, fetched against a EUR base and then converted into each company's base currency, so every currency you trade in stays aligned.

Accounting reference

How Carbon posts to the ledger — what Xero mirrors.

Invoices

The sales and purchase invoices that sync to Xero.