How to update a usageCharge

[WillKickplan]

Once you have created a usageCharge, how do you update or change it? Why do they have IDs, and a GET interface, if you can't change them?

If the charge is for more than it was supposed to be, can you use (REST) ApplicationCredit  or  (Graphql) appCreditCreate to offset the charge? 

[ShopifyDevSup]

Hey @WillKickplan , 

That's a great question. Usage charges are applied to the merchants invoice as soon as they are created, so that is why they can't be updated or changed. 

The available options for adjustments would be either a credit or a refund. Our documentation here covers the differences, so you can review that to see what will work best for your current billing structure https://shopify.dev/docs/apps/launch/billing#pricing-adjustments 

Hope that helps, 

- Kyle G.