title: What is this mean in GrqphQL Expected type '[OrderCreationNotificationEnum!]
body: <p>I have a service who provided me api to use and they are using GraphQL.</p>
  <p>Everything else seems working fine apart from this section.</p>
  <p>I'm using the following query to create an order and it's working fine apart from when I add notifications in there</p>
  <p>I'm getting this error
  Argument 'notifications' on InputObject 'OrderCreateMutationInput' has an invalid value ({type: {OrderCreationNotificationEnum: {email: true}}}). Expected type '[OrderCreationNotificationEnum!]'</p>
  <pre><code>mutation{
  orderCreate(input: {
  order: {
    externalIds:[
      {key: &quot;VRPOrderId&quot;, value: &quot;abc131&quot;}
    ]
    firstName: &quot;John&quot;
    surname: &quot;Doe&quot;
    phone: &quot;0405123456&quot;
    billingFirstName: &quot;John&quot;
    billingSurname: &quot;Doe&quot;
    
    billingEmailAddress: &quot;john@email.com&quot;
    address: {
      address: &quot;1 Bourke Street&quot;
        city: &quot;Melbourne&quot;
        country: {
          code: &quot;AU&quot;
        }
        postcode: &quot;3000&quot;
        state: {
          short: &quot;VIC&quot;
        }
    }
    billingAddress:{
      address: &quot;1 Bourke Street&quot;
        city: &quot;Melbourne&quot;
        country: {
          code: &quot;AU&quot;
        }
        postcode: &quot;3000&quot;
        state: {
          short: &quot;VIC&quot;
        }
    }
    termsAndConditionsAccepted: true
    
  }
  lineItems: [
    {             
      variantId: &quot;VmFyaWFudC00NzMz&quot;
      quantity: 1
      totalCents: 22500
      postageCents: 1000
      
    },
    {             
      variantId: &quot;VmFyaWFudC00NzYy&quot;
      quantity: 1
      totalCents: 22500
      postageCents: 500
      
    }
  ]
  notifications:
  {
      type: {
          OrderCreationNotificationEnum: {
              email: true
          }
      } 
  }
  
  })
  {
  order{
    id
    invoices{
      edges{
        node{
          id
          lineItems{
            id
            quantity
          } 
        }  
      }
    }
  }
   status
  }
  }
  </code></pre>
  <p>I am struggling to get the notification working. I'm adding link for the instructions too. Please help.</p>
  <p><a href="https://api.marketplacer.com/graphql/ordercreationnotificationenum.doc.html" rel="nofollow noreferrer">link to api document</a></p>