Oracle Fusion Cloud ERP and Square integration

What moves between them

Payments and invoices flow from Square into Oracle Fusion. When a Square payment is completed or refunded, ml-connector receives the webhook notification, maps the transaction to the corresponding Oracle Fusion GL accounts and cost centers based on your configuration, and posts a balanced journal entry into Oracle Fusion's journalLines. Invoice records follow the same pattern. Data flows in one direction only, as Oracle Fusion is the system of record for general ledger balances. The integration runs either on demand via API or on a schedule you define.

How ml-connector handles it

ml-connector stores both the Square OAuth token and the Oracle Fusion OAuth credentials encrypted, refreshing each when approaching expiry. It subscribes to Square webhooks for payment.created, payment.updated, refund.created, and invoice.created events, validating each webhook signature via HMAC-SHA256 using the shared secret. Upon receiving a payment event, it translates the Square payment amount, currency, and category into a debit to the appropriate Oracle Fusion GL account and a credit to a receivables or bank clearing account, according to your account mapping rules. Unmatched payments or missing GL accounts are logged to the audit trail for manual review. Because Oracle Fusion rate limits are undocumented, the integration includes backoff and retry logic for transient failures, and every record carries a full audit trail for replay if a GL posting fails.

A real-world example

A small-to-mid-sized retail chain uses Square for point-of-sale and online payments across four locations and a fulfillment center, and uses Oracle Fusion Cloud ERP for accounting and inventory across the organization. Previously, each location manager logged Square transactions manually at month-end, and the finance team reconciled cash, receivables, and sales by hand, often discovering discrepancies days after the fact. With Oracle Fusion and Square connected, every Square payment - whether in-store or online - flows directly into the Oracle Fusion general ledger within minutes of completion, allocated to the correct business unit or location. Month-end reconciliation is eliminated, cash is always current, and the team focuses on analysis instead of data entry.

What you can do

• •Sync Square payments and refunds into Oracle Fusion GL accounts with automatic journal entry creation and full account mapping.
• •Receive Square invoice and order data via webhooks and post them as journal entries in Oracle Fusion aligned to your Chart of Accounts.
• •Handle OAuth2 token refresh for both Square (30-day expiry) and Oracle Fusion (1-hour expiry) transparently.
• •Validate every Square webhook with HMAC-SHA256 signature verification and store full audit trail for every transaction.
• •Retry failed GL postings with exponential backoff and surface unmatched payments or missing GL accounts for manual review.

Questions

Can ml-connector sync data from Oracle Fusion back into Square?

No. Oracle Fusion is the system of record for GL balances, so data flows one direction only, from Square into Oracle Fusion. Square payment categories and orders are pulled and mapped to Oracle Fusion GL accounts, but changes to GL accounts or cost centers in Oracle Fusion do not propagate back to Square. You manage account mappings in ml-connector configuration.

How does ml-connector handle Square payments that do not have a clear GL account match?

When a Square payment or invoice arrives without a matching GL account in your configuration, ml-connector logs the full transaction details to the audit trail, declines to post the entry, and surfaces it for manual review. You can then add the missing mapping and re-run the integration to post the entry retroactively. Every unmatched record carries the original Square transaction ID for traceability.

What happens if the Oracle Fusion GL account combination does not exist?

Oracle Fusion GL posting fails with the invalid account combination error, and ml-connector catches the error, logs it with full context, and retries with exponential backoff. If the account combination remains invalid after retries, the record is flagged in the audit trail for manual intervention. You can then create the missing account combination in Oracle Fusion and replay the integration job.