Reference number of invitation before booking a flight to iran

Reference number of invitation before booking a flight to iran - White and Black Road Sign on Green Grass Field

We (2 Germans) are about to visit Iran in February and want to cross the border coming from Armenia. We don't have a reference number yet. This reference number is needed for getting a visa. You can get this reference code by a travel agency or a Iranian host gets you this number. I've heard, that you need the reference code before booking the flight. We have booked the flight already. Is this a problem?






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