Good morning, a question to send an invitation to Cuba and the person who sends it is Mexican so that the person arrives in Tihuana

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Ok, excuse me, let me explain, there is a Mexican person living in Tijuana and he decides to send an invitation letter to Cuba. I know that he has to go to the Mexican consulate, but what are the requirements that the Mexican consulate will ask for to be able to send that invitation to Cuba for that person can process the documentation there in Cuba to fly to Mexico

I don't know if someone understood you, but I don't