Multisig

To create a multisig session:

const session: Session = {
  owners: {
    type: 'ecdsa',
    accounts: [accountA, accountB, accountC],
  },
}

You can also specify the signature threshold (i.e., how many signatures are required to authorize the transaction):

const session: Session = {
  owners: {
    type: 'ecdsa',
    accounts: [accountA, accountB, accountC],
    threshold: 2,
  },
}

By default, the threshold is 1 (any session owner account can authorize any transaction within the session).