activate method
Implementation
@override
Future<void> activate(String topic) async {
_checkInitialized();
final int expiry = WalletConnectUtils.calculateExpiry(
WalletConnectConstants.THIRTY_DAYS,
);
await pairings!.update(
topic,
expiry: expiry,
active: true,
);
await core.expirer.set(topic, expiry);
}