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.