How to verify upgradeable contract on opbnb-testnet by Hardhat?

Hi, you can follow the instructions from How to verify a contract on Etherscan/BscScan/PolygonScan to use the solc-input.json to verify the proxy.
Your constructor arguments for the verification should be:

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