Hi @Tomas_Friedrich,
I just looked into the webhook not firing on variant metafield change, and I'm not 100% clear on the expected behaviour. Since the webhook fires on changes to the product metafield, I would expect the same behaviour to apply for variants. I'll raise this with our developers to clarify.
In the meantime, I have a few suggestions that should help. Even if you're able to use webhooks, I still suggest using one of these methods to run a job at least once a day to check for anything that may have been missed. Although webhooks are generally reliable, it's possible for a webhook not to deliver in cases of unexpected problems on Shopify's end or yours.
One alternative to the REST API is making your calls using GraphQL. Since GraphQL allows you to specify the individual fields you want in the response, you're able to retrieve a larger data set using few calls. The below call will allow you to retrieve the metafields for 10 products at a time:
{
products(first: 10) {
pageInfo {
hasNextPage
hasPreviousPage
}
edges {
cursor
node {
id
variants(first: 10) {
pageInfo {
hasNextPage
hasPreviousPage
}
edges {
cursor
node {
id
privateMetafields(first: 3) {
edges {
node {
id
key
namespace
value
}}}}}}}}}}
The most efficient way to get this data is by using the [BulkOperations API](https://shopify.dev/tutorials/perform-bulk-operations-with-admin-api). This API will allow you to retrieve every variant metafield in a shop using only 2 calls, and the data is delivered in a flat JSONL. It works by taking in a regular graphQL query, with any fields related to pagination removed. Here's an example of a BulkOperation using the example query from above:
mutation {
bulkOperationRunQuery(
query: """
{
products {
edges {
node {
id
variants {
edges {
node {
id
privateMetafields {
edges {
node {
id
key
namespace
value
}}}}}}}}}}
"""
) {
bulkOperation {
id
status
}
userErrors {
field
message
}
}
}
