{
  ...
  "variables": {
    "certificateName": "[concat(parameters('certificatePrefixName'), uniqueString(resourceGroup().id))]"
  },
  "resources": [
    {
      "apiVersion": "2015-08-01",
      "name": "[variables('certificateName')]",
      "type": "Microsoft.Web/certificates",
      "location": "[resourceGroup().location]",
      "properties": {
        "pfxBlob": "[parameters('certificatePfxBase64')]",
        "password": "[parameters('certificatePfxPassword')]"
      },
      "tags": {
        "displayName": "Certificate"
      }
    }
  ]
  ...
}