post https://api.reepay.com/v1/webhook/update
Webhooks can be updated and re-sent in one operation. New URL, optional HTTP username, optional HTTP password, and a list of webhook ids or event ids identifying the webhooks must be provided. A maximum of 100 ids is allowed for each request.
Returns an array of Webhooks, containing all the updated webhooks. The webhooks state will have been set to pending.