List purchase orders

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Retrieve a paginated list of purchase orders with optional filtering by status, warehouse, dates, and other criteria.

{
  "purchase_orders": [
    {
      "purchase_order_id": "se-234",
      "order_number": "02162026-02",
      "supplier_id": "se-567",
      "supplier_name": "Acme Widgets Inc",
      "status": "open",
      "order_date": "2025-01-15T00:00:00Z",
      "expected_delivery_date": "2025-02-01T00:00:00Z",
      "create_date": "2025-01-14T10:30:00Z",
      "modify_date": "2025-01-14T10:30:00Z",
      "reference_number": "REF-12345",
      "warehouse_id": "se-123456"
    }
  ],
  "total": 150,
  "page": 2,
  "pages": 3,
  "links": {
    "first": {
      "href": "https://api.shipstation.com/v2/purchase_orders?page_size=50"
    },
    "next": {
      "href": "https://api.shipstation.com/v2/purchase_orders?cursor=eyJQYWdlIjoyLCJPcmRlck51bWJlciI6bnVsbCwiU3RhdHVzIjpudWxsLCJXYXJlaG91c2VJZCI6bnVsbCwiUmVmZXJlbmNlTnVtYmVyIjpudWxsLCJDcmVhdGVEYXRlU3RhcnQiOm51bGx9"
    }
  }
}