Prepare Setup a) Open Remix and select the plugins

1. Go to Remix: remix.ethereum.org.
2. In the left sidebar, ensure Solidity Compiler and Deploy & Run Transactions are enabled.

Prepare Setup b) Create the callback contract

1. In the File Explorer, click New File → name it CallDecryptionOracleDemoContract.sol.
2. Copy and Paste the code below and Save.

Error during retrieving content skip as ignoreDownloadError activated.

Prepare Setup c) Compile

• Open Solidity Compiler → set Compiler to 0.8.24 (or newer that supports 0.8.24 sources).
• Click Compile CallDecryptionOracleDemoContract.sol and ensure no errors.

Prepare Setup: d) Connect wallet and select environment

• Ensure your wallet is on the desired network, either Polygon Mainnet or Ethereum Mainnet or Polygon Test Amoy or Ethereum Test Sepolia.
• Open Deploy & Run Transactions panel.
• Set Environment to Injected Provider – MetaMask. Approve the connection if prompted.

Prepare Setup e) Deploy CallDecryptionOracleDemoContract

• (Still in Deploy & Run Transactions panel)
• In Contract, choose CallDecryptionOracleDemoContract.
• In Deploy & Verify add the Constructor arguments and paste the oracle address:
  • If you are on Ethereum Mainnet: 0x13E6464A85a63c9214a4F04cd942466F35D17E54
  • If you are on Polygon Mainnet: 0x22a687a3a0F958AccC1395C4D134F297eaCa1B2B
  • If you are on Sepolia - Ethereum Testnet: 0x668a5e0eE0dD80F08AE7cf7D91Af84d6bB28f70D
  • If you are on Amoy - Polygon Testnet: 0x27aF9135aF9a7FEe7f9dde4d595E200B0c602576
• Click Deploy.
• Confirm in MetaMask: Confirm the transaction in MetaMask.

Open the Demo Contract under Deployed Contracts. You may now use its methods.