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# Create purchase orders

> How to create purchase orders in customer ERP/accounting platforms and track billing using the Merge Accounting API.

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#### See 'sync customers or suppliers' use case

You have already followed the ["Sync Customers or Suppliers"](/merge-unified/use-cases/sync-customers-or-suppliers) use case to ensure the vendors across your database and your customer's accounting/ERP system are in sync.

#### Retrieve chart of accounts or items

You'll have to specify a general ledger account or item on each line item of the purchase order. We suggest keeping this data in sync by storing the data in the [**GET** /accounts](https://docs.merge.dev/accounting/accounts/) and [**GET** /items](https://docs.merge.dev/accounting/items/#items_list) endpoints.

#### Build a trigger to create purchase orders

Identify when to send Purchase Orders to your customer's accounting platform. This could be a button or form within your app's frontend or event-based logic built within your backend.

#### Create a purchase order

Submit a [**POST** /purchase-order](https://docs.merge.dev/accounting/purchase-orders/#purchase_orders_create) request to create the purchase order in your customer's Accounting platform.

#### Identify when a purchase order is billed

Utilize the [**GET** /Invoices](https://docs.merge.dev/accounting/invoices/#invoices_list) endpoint to follow the purchase order through the billing process. Once billed, an invoice will exist with a reference to the created purchase order through the `purchase_orders` field.

#### Simplify your Purchase Order integration with Merge

Integrate today or talk to our sales team to learn how Merge unlocks hundreds of integrations in days - not years.

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