Hello @Denn ,
Is there a way to check whether a web-hook subscription is being delivered properly?
Yes, check the Webhook metrics report in your Partner Dashboard.
If this is still unresolvable on your side with the information in the report, please DM me with specific details so we can take a deeper look.
Do we need to re-register web-hooks after updating to the latest API?
Updating the webhooks to an API version involves registering them under the desired version as per this tutorial. To my understanding this update should not be a reason for you to not receive the billing success webhook inconsistently between shops.
Please keep us posted.
Best,
Juan