Nigerwife cards

Hi everyone!
I'm new at all of this , but if someone could shed any light on how the "Niger wife" card works I'd really appreciate it!
So my husband is in Lagos and he has my Niger wife card, but I am baffled because he still has to write a letter for my visa approval. And what makes little to no sense to me it that he still has to put the visitation dates on the letter although I am approved to stay there long term.
So my question is to anyone who is familiar with this process please tell me what visa am I asking for?
The Niger wife status is in a card form. I have read so many blogs on it , but not how to process a request for a long term visit to Nigeria using the card!
Please enlighten me if any of you know!
God bless!!!

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