Whether the Moip API v2 allows 2 different merchant accounts to use the same identifier («ownId») for a customer (in a «POST /v2/customers» request)?

Other words, is it safe to use a simple identifier like the customer’s email address as the value of the ownId parameter of the POST /v2/customers API request, or it will fail if another merchant will use the same identifier for the customer?

I have got an answer from Moip support:

Yes, it’s safe, because the ownid belongs to your token and key, on this way, if another merchant uses the same ownid to specific transaction, it’s don’t will be a problem, because the authentication will be different.