Obtain your balance by exploring the node (Bitcoin Core) in your wallet’s xpub.

I use Umbrella Node with my wallet. For development reasons, I am running a Bitcoin Core Node. Now I’ve connected to a Bitcoin Core node, but I can’t figure out how to scan the address. All methods found at https://en.bitcoin.it/wiki/Original_Bitcoin_client/API_calls_list only work if you have a Bitcoin Core Wallet. But my wallet has xpub which generates all the addresses. Now we need to retrieve that address from the blockchain. How can we achieve this?