Oracle NetSuite and AvidXchange integration

What moves between them

Reference data and invoices flow from Oracle NetSuite into AvidXchange. Vendors are pushed first, because a payee must exist in AvidXchange before an invoice can be coded against it, followed by GL accounts and the department, class, and location dimensions so AP staff code against valid values. Vendor bills are submitted as invoices, with line items, amounts, GL codes, any PO reference, and the invoice image. After AvidXchange routes, approves, and executes payment, ml-connector reads the settled payment detail, the check number, ACH trace, or virtual card, back into NetSuite as a vendor payment applied to the originating bill. GL accounts and dimensions are read-only in AvidXchange, so ml-connector never writes coding tables back from AvidXchange into NetSuite.

How ml-connector handles it

ml-connector stores both credential sets encrypted. For NetSuite it signs a JWT with the customer's private key, exchanges it at the account-specific token endpoint, and re-runs the flow when a 60-minute token expires or a call returns 401, accepting the account ID per customer since there is no shared base URL. For AvidXchange it attaches the Company and User tokens as headers on every request. Vendors are synced before any invoice, and NetSuite GL accounts and dimensions are mapped to AvidXchange GL codes so every invoice line lands on a valid account. Because AvidXchange has no webhooks, payment and invoice status are polled on a schedule, typically every 15 to 30 minutes, and each settled payment is matched to its bill and posted as a NetSuite vendor payment. Reads use SuiteQL where a list or filter is needed, since the Record API collection GET is slower. NetSuite returns HTTP 429 when its concurrency or frequency governance is exceeded, so ml-connector backs off with jitter and honors Retry-After. Bill submission uses an externalId so a retried submission upserts rather than creating a duplicate invoice, and the NetSuite M2M certificate expiry is tracked so a renewal does not become an outage. A sandbox refresh clears the certificate mapping, so the connector surfaces a re-upload prompt when sandbox auth begins to fail.

A real-world example

A mid-sized property management firm with about 300 employees runs Oracle NetSuite for accounting across several managed buildings and uses AvidXchange to pay its trade vendors. Before the integration, AP staff exported the vendor list and GL codes from NetSuite into AvidXchange by hand whenever they changed, keyed bills into both systems, and after each payment run re-entered check and ACH details into NetSuite to clear the open bills, which left the ledger out of step for days. With Oracle NetSuite and AvidXchange connected, vendors, GL accounts, and the location and class dimensions stay aligned, bills submit once, and every executed payment posts back as a vendor payment applied to the right bill. The open payables balance is accurate the same day a payment clears.

What you can do

• •Push Oracle NetSuite vendors into AvidXchange before invoicing so every payee is on file and payments route correctly.
• •Sync NetSuite GL accounts and the department, class, and location dimensions into AvidXchange for accurate invoice coding.
• •Submit NetSuite vendor bills as AvidXchange invoices with line items, GL codes, PO references, and invoice images.
• •Post each executed AvidXchange payment back into NetSuite as a vendor payment applied to the originating bill.
• •Bridge the NetSuite OAuth 2.0 certificate flow and AvidXchange tokens, polling payment status with retries and a full audit trail.

Questions

Which direction does data move between Oracle NetSuite and AvidXchange?

Reference data and invoices move from Oracle NetSuite into AvidXchange, and settled payment detail moves back from AvidXchange into NetSuite. Vendors, GL accounts, and accounting dimensions are pushed in so invoices can be coded, then each executed payment posts back as a NetSuite vendor payment. GL accounts and dimensions are read-only in AvidXchange, so ml-connector does not write coding tables back into NetSuite from AvidXchange.

How does the integration handle NetSuite's certificate-based authentication?

NetSuite's recommended OAuth 2.0 Client Credentials flow uses a signed JWT rather than a client secret, so ml-connector holds the customer's private key, signs the assertion, and exchanges it for a 60-minute token at the account-specific endpoint. It re-runs the flow when the token expires or a call returns 401 and tracks certificate expiry so a renewal does not cause an outage. Because a sandbox refresh clears the certificate mapping, it surfaces a re-upload prompt when sandbox auth starts failing.

How does the connector detect new payments without webhooks?

AvidXchange has no public webhook support, so ml-connector polls the payment and invoice status endpoints on a schedule, typically every 15 to 30 minutes. When a payment is settled it reads the check number, ACH trace, or virtual card detail and posts it into NetSuite as a vendor payment applied to the originating bill. Submissions use an externalId so a retried call upserts rather than creating a duplicate.