# Sequence: sync customers, products, subscriptions and invoices

Connect Sequence to sync AR customers, products, subscriptions, and sent invoices; optional payment and field write-back.

Connect **Sequence** so Cortena Accounts Receivable stays aligned with your Sequence customers, products, billing schedules (subscriptions), and sent invoices. Optional write-back can push payment status and a few invoice fields back to Sequence.

**Who this is for:** AR admins who use Sequence as an invoice / subscription source of truth and want those documents visible in Cortena Receivables (open items, banking match, payment advice).

## 1. Connect Sequence

1. Open **Settings → Integrations → Billing → Sequence**.
2. Enter your Sequence API credentials and save.
3. Confirm the integration shows as connected.

Ask Cortena Support if **Sequence** is not visible. Your workspace may need the Sequence feature enabled.

## 2. What syncs

| Domain | What Cortena imports |
| --- | --- |
| **Customers** | Sequence customers into AR customers |
| **Products** | Catalog products |
| **Subscriptions** | Billing schedules |
| **Invoices** | Sent / final / voided invoices (drafts in Sequence are skipped) |

Synced receivables are marked as coming from an **external source**. Cortena does **not** re-run the full “issue invoice” workflow for those documents; you can still apply payments and match bank transactions.

Use **Sync now** per domain (or sync all) after connect. Progress updates live in the Settings panel.

## 3. Optional write-back

When write-back is enabled (feature flag **and** the Settings toggle):

| Change in Cortena | Sent to Sequence |
| --- | --- |
| Payment applied | Payment status on the Sequence invoice |
| Due date, memo, PO, reference | Patch on the sent invoice |

Leave write-back **off** if Sequence should stay the only place that updates those fields.

## Tips and limitations

- Spreadsheet AR sync does not soft-delete Sequence-owned rows (feeder ids are namespaced).
- Sequence bank sync and creating invoices *in* Sequence from Cortena drafts are out of scope for this integration.
- Related: [Accounts receivable](https://help.cortena.ai/guides/advanced/accounts-receivable), [Open items and payment write-back](https://help.cortena.ai/guides/advanced/open-items-write-back), [Subscriptions workspace](https://help.cortena.ai/guides/advanced/subscriptions-workspace).

## Quick reference

| Task | Where |
| --- | --- |
| Connect / Sync now | Settings → Integrations → Billing → Sequence |
| Review imported invoices | Receivables → Invoices |
| Turn write-back on/off | Same Sequence settings card |