mutation SetCustomerMetafield(
$metafieldNamespace: String!
namespace: $metafieldNamespace
type: "single_line_text_field"
namespace: $metafieldNamespace
{% assign customer_id = 700837494845 %}
{% assign customer = shop.customers[customer_id] %}
{% assign existing_metafield = customer.metafields.test | where: "key", "test" | first %}
{% assign variables = hash %}
{% assign variables["customerId"] = customer.admin_graphql_api_id %}
{% assign variables["metafieldNamespace"] = "test" %}
{% assign variables["metafieldKey"] = "test" %}
{% assign variables["metafieldId"] = existing_metafield.admin_graphql_api_id %}
{% assign variables["metafieldValue"] = "now" | date: "%s" %}
{% action "shopify" query: query, variables: variables %}