How to integrate Bitcoin wallet or ETH into Exchange platform?

How to integrate Bitcoin wallet or ETH into Exchange platform?

I have created a website exchange cryptocurrency, the interface has been completed

But I am having problems with integrating wallet for each user on my website.

Can you guide me how to integrate Crypto wallet? Bitcoin, Ethereum, ....

I noticed the trading platform just Nodes, explorer, ... they were able to integrate the wallet of that Coin.

Are there any guidelines for this integration? Please help me, thank you very much!

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