SAP Business One and Plaid integration

What moves between them

Payment records flow primarily from SAP Business One into Plaid for matching and enrichment. ml-connector polls SAP Business One's IncomingPayments and OutgoingPayments on a configurable schedule (daily or weekly by default), extracts the payment amount and date, queries Plaid's transactions endpoint to find the corresponding bank transaction, and writes back an enriched journal entry or line item into SAP Business One's JournalEntries with the Plaid transaction ID and bank account details. Reference data such as bank account mappings are configured once and reused across syncs. Transactions flow as read-mostly; Plaid's transfer endpoints can also be used to initiate new outbound payments from SAP if desired, with receipts written back to OutgoingPayments.

How ml-connector handles it

ml-connector maintains SAP Business One's session token by issuing a fresh POST /Login before each polling cycle and reusing the returned B1SESSION for all subsequent calls in that cycle, avoiding the 5-second cold-start penalty of stateless auth. It queries IncomingPayments and OutgoingPayments using OData $filter with UpdateDate >= last_sync_time to fetch only new or changed records since the previous run. For each payment, it looks up the corresponding Plaid transaction by amount and settlement date using the transactions/sync or transactions/get endpoint. Because Plaid requires ES256 JWT verification on all webhooks, ml-connector decodes the JWT, validates the JWK signature and iat claim age (rejecting if older than 5 minutes), and computes the SHA-256 of the raw body to check against request_body_sha256. Payment records that fail to match are stored with full audit and can be replayed manually. Idempotency is enforced on the Plaid side using the 48-hour idempotency_key for transfers. SAP Business One's lack of documented idempotency keys is handled by checking the DocNum field before retrying any failed inbound record.

A real-world example

A mid-sized manufacturing firm uses SAP Business One for its general ledger, purchasing, and inventory, and maintains bank accounts at two regional institutions connected to Plaid. During monthly reconciliation, the accounting team manually compares payments in the SAP ledger to cleared transactions in the bank portal, a process that takes two days and often finds timing mismatches that require investigation. With SAP Business One and Plaid connected, each new payment in SAP is automatically matched to its bank transaction the next day, and Plaid's settlement date and transaction ID are written back into the SAP journal entry as reference data. Month-end reconciliation now takes a few hours; the team starts with a report of unmatched payments (which are rare and usually legitimate timing differences) rather than a raw list of everything to manually check.

What you can do

• •Poll SAP Business One payment records on a schedule and match each to its bank transaction in Plaid by amount and date.
• •Enrich SAP Business One journal entries with Plaid transaction IDs and bank settlement details for audit trails.
• •Manage SAP Business One session token lifecycle, reusing sessions within a single polling cycle to avoid repeated login overhead.
• •Verify Plaid webhook signatures using ES256 JWT validation and reject unsigned or expired webhooks.
• •Track unmatched payments and replay failed matches with a full audit log.

Questions

How does ml-connector handle SAP Business One's session token expiry and OData filtering?

ml-connector issues a fresh POST /Login at the start of each polling cycle and reuses the returned B1SESSION token for all subsequent queries in that cycle, avoiding the 5-second cold-start cost of per-request authentication. It queries only new or changed records using OData $filter with UpdateDate >= last_sync_time, reducing the volume of data fetched and keeping polling efficient even with large ledgers.

What does ml-connector do if a payment in SAP Business One does not match a Plaid transaction?

Unmatched payments are logged with full audit context including the SAP payment amount, date, and payment method, plus the Plaid transaction query results. These records can be replayed manually once the mismatch is resolved (such as a timing difference or a missing Plaid transaction that arrives later). A status field on each record indicates whether it matched, failed to match, or is pending retry.

Does the integration require special SAP Business One or Plaid setup?

Plaid integration requires that per-user access tokens be obtained once through the Plaid Link web flow, which is handled during configuration. SAP Business One requires that the customer provide the Service Layer base URL and credentials for the service account; if webhooks are desired, the customer must activate the Webhook Messenger Service through SAP administration, but polling is the default and does not require additional setup.