We are getting 403 while creating usage charge. Our app is in review process. We can create a Recurring Charge. However, when we try to create a Usage Charge by followinghttps://help.shopify.com/en/api/reference/billing/usagecharge, we are getting 403. We have tried removing "test:true" from corresponding recurring charge too. No effect. We are testing against dev shop, could that be a reason? We are able to activate a recurring application charge against the same shop and then getting 403 while creating a usage charge.
Please help. Thanks.