To find your OrderID please follow the steps below:
Web Users: Please go to the Nomad website and go to "My eSIM" --> "Order Details" --> "Order No.", you can click copy to get your OrderID
iOS Users: Please go to the iOS app and go to “Profile” → “Order History” → choose the plan you want to get the OrderID for → “Order Details” → “Order No.” → and you can click copy to get your OrderID.
Alternatively, you can go to your email receipt (the first email you receive after purchasing a plan) and find your OrderID there (it is the first line item in the receipt).