-The addresses of the tokens are extracted from the ABI.json of https://rinkeby.etherscan.io/

-In the environment file you will find the link of the infura.rinkeby gateway for the connection to the ethereum test network, as well as the addresses of the buyer account with ETH faucets and its private key to achieve the simulation in the blockchain network.

-At the end of the program execution, the hash of the token purchase test transaction is printed to simulate the binding curve to review the search for information also at https://rinkeby.etherscan.io/