微信支付预授权相关问题?

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Now the scene: the sub merchant is a hotel business place, and he needs deposit related functions. I searched a lot of materials and learned a word called pre authorization. Then I searched for the related word of pre authorization, and then a word called wechat BD appeared. I now have two problems, one of which is how to open or apply for pre authorization related functions, (PS: I hope the answer to this question is not to ask me to go to wechat BD) Secondly, how to find that wechat BD. I hope the official can give an answer

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