Adding metafield to Orders/Paid webhook payload

[AlexPinto]

Hi,

I am trying to create a webhook that sends me the data of a paid order. However, besides the "default" fields that come with the webhook, i want to include 2 metafields that i created inside "order".

The namespace of the metafields is "checkoutblocks" and the keys for the metafields are "nif" and "dni".

I am using Javascript with this code to subcribe the webhook:

var query = `

        mutation webhookSubscriptionCreate($topic: WebhookSubscriptionTopic!, $webhookSubscription: WebhookSubscriptionInput!) {

            webhookSubscriptionCreate(topic: $topic, webhookSubscription: $webhookSubscription) {

                webhookSubscription {

                    id

                    createdAt

                    topic

                    filter

                    format

                    includeFields

                    metafieldNamespaces

                    metafields {

                        key

                        namespace

                    }

                }

                userErrors {

                    field

                    message

                }

            }

        }

    `;

    var input = {

        topic: "ORDERS_PAID",

        webhookSubscription: {

            callbackUrl:"myURL",

            format:"JSON"

        },

        metafieldNamespaces: ["checkoutblocks"],

        metafields: [

            {

                key:"nif",

                namespace:"checkoutblocks"

            },

            {

                key:"dni",

                namespace:"checkoutblocks"

            }

        ]

    }

    try {

        const client = new shopify.clients.Graphql({ session });

        const response = await client.request(query,{variables:input});

        console.log(response.data.webhookSubscriptionCreate.webhookSubscription);

        console.log(response.data.webhookSubscriptionCreate.userErrors);

    } catch (error) {

        console.error("Error:", error);

    }

However, i am getting this return message:

{
id: 'gid://shopify/WebhookSubscription/123',
format: 'JSON',
apiVersion: { displayName: '2025-01', handle: '2025-01' },
createdAt: '2025-04-10T17:12:06Z',
filter: null,
endpoint: {
callbackUrl: 'myURL'
},
includeFields: [],
metafieldNamespaces: [],
metafields: [],
topic: 'ORDERS_PAID'
}

I am not sure if i am doing this in the right way. I think the response should have included the "metafieldNamespaces" and "metafields" that i have sent.

Can someone help me with this topic? Thanks