Refund an Invoice

curl --request POST \
  --url https://api.sandbox.getasset.com/v0/business/{business_id}/refund \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "amount": 100,
  "refund_external_id": "<string>",
  "refunded_at": "2023-11-07T05:31:56Z",
  "method": "cash",
  "invoices_to_refund": [
    {
      "amount": 100,
      "invoice_id": "inv_WQMDNUHpBThYSNh4AprDBo",
      "invoice_external_id": "ext_inv_001",
      "invoice_line_id": "inl_WQMDNUHpBThYSNh4AprDBo",
      "memo": "Refund for returned item"
    }
  ],
  "memo": "Customer returned defective item",
  "processor": "John Doe",
  "is_return": false
}
'

{
  "data": {
    "business_id": "<string>",
    "external_id": "<string>",
    "amount": 123,
    "method": "cash",
    "refunded_at": "2023-11-07T05:31:56Z",
    "id": "<string>",
    "amount_paid": 0,
    "memo": "<string>",
    "processor": "<string>",
    "is_return": false,
    "status": "pending",
    "payments": [
      {
        "amount": 123,
        "id": "<string>",
        "transaction_id": "<string>"
      }
    ],
    "refund_invoices": [
      {
        "amount": 123,
        "id": "<string>",
        "invoice_id": "<string>",
        "invoice_line_id": "inl_WQMDNUHpBThYSNh4AprDBo",
        "external_id": "<string>",
        "memo": "<string>"
      }
    ]
  }
}