Hello, 
Is there another way to update the selling plan for product variants?
When merchants update a product, I want to update the selling plan for product variants based on X conditions. What I’m doing is removing all product variants from https://shopify.dev/docs/api/admin-graphql/2024-10/mutations/sellingPlanGroupRemoveProductVariants and then adding the appropriate ones with https://shopify.dev/docs/api/admin-graphql/2024-10/mutations/sellingPlanGroupAddProductVariants. This works perfectly when using the app, but when the webhook is triggered, the add mutation fails and returns an error:
{ field: [ 'productVariantIds' ], message: 'Resource has already been taken' }
As I mentioned, it works fine in the app, without errors, but not on the webhook. Why is that? Is it due to Shopify’s cache?