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matic.js internally uses ABIManager for handling ABI management, configuration for you. All of the ABI and config are taken from static repo.

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Change ABI

Sometimes you are required to change the ABI, particularly when you are developing a contract. You can do so by using ABIManager. Syntax 
import { ABIManager } from '@maticnetwork/maticjs'


const manager = new ABIManager(<network name>,<version>);
await manager.init();

// set abi

manager.setABI(<contract name>,<bridge type>, <abi value>);

// get abi

manager.getABI(<contract name>,<bridge type>);
The network name, contract name, bridge name etc can be taken from our official static repo. Example 
import { ABIManager } from '@maticnetwork/maticjs'


const manager = new ABIManager('testnet','amoy');
await manager.init();

// set abi

manager.setABI('ERC20PredicateProxy','pos', 'abi value');

// get abi

manager.getABI('ERC20PredicateProxy','pos');