Request Headers:
Content Type: application/json
Ocp-Apim-Subscription-Key: ********************
Authorization: Bearer *********************
Request Body
{
  "mT_Availability_S_Request": {
    "availability": {
      "partnerKey": "[PARTNERKEY]",
      "countryCode": "NL",
      "products": [
        {
          "productNumber": "8201",
          "longProductNumber": "8201"
        }
      ]
    }
  }
}