Voucher Roaming in Two Mikrotik Routers

I have two Mikrotik router model rb5009 used in two different networks. How can I use the same voucher code on both Mikrotik routers? I mean I want to do Voucher Roaming like Mobile Operators. Please help me.

this can be done using radius server or user-manager in Mikrotik

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Any tutorial or video instructions? Please.

Is not hard just to check on youtube

https://www.youtube.com/results?search_query=user-manager