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Ensuring you’re using the latest version of Foundry, via foundryup
Foundry is a tool that helps take the heat off smart contract development steps, including compiling, deploying and finally submitting your contract for verification. This assumes you already have a Foundry project, setup, and you’re about to deploy and verify next.

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Deploy and Verify

forge create --broadcast --rpc-url https://rpc.sepolia.ethpandaops.io --private-key YourPrivateKey src/ContractFile.sol:ContractName --verify --verifier etherscan --etherscan-api-key YourApiKeyToken

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Verify an Existing Contract

forge verify-contract --watch --chain sepolia 0x324eca20b358b18e48f2611f7452560ce3b3c1bb src/ContractFile.sol:ContractName --verifier etherscan --etherscan-api-key YourApiKeyToken

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Custom Chains

Most chains with an Etherscan explorer are supported using the --chain flag. For (very) new chains that aren’t natively supported by Foundry, you can use a custom --verifier-url Append the Etherscan V2 base path and the new chainId, in this example for Stable Testnet(2201). 
forge verify-contract 0x324eca20b358b18e48f2611f7452560ce3b3c1bb src/ContractFile.sol:ContractName --verifier etherscan --verifier-url "https://api.etherscan.io/v2/api?chainid=2201" --etherscan-api-key YourEtherscanApiKey --watch
This open source integration was shipped by @iainnash and the Foundry team