merchant account

Hello,
I need some advise on my merchant account please.
So I process transactions on my eCommerce website for which a merchant account exists. In the meantime, I have another website with different items for sale and I would like conduct those sales through my initial merchant account.
I am aware that merchant account providers do not allow this but perhaps someone here could show me a working scheme, like how this can be done.
I am willing to pay for such a consultation.

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