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How To Create Permissions

To create new permissions, submit a transaction to the updateauth action of the eosio account.

In the example shown below useraaaaaaaa creates a new permission called my_new_permission on the account useraaaaaaaa, with the public key PUB_R1_6FPFZqw5ahYrR9jD96yDbbDNTdKtNqRbze6oTDLntrsANgQKZu.

const authorization_object = { 
  threshold: 1, 
  accounts: [{
    permission: {
      actor: "useraaaaaaaa", 
      permission: "active"
    }, 
    weight: 1 
  }], 
  keys: [{ 
    key: 'PUB_R1_6FPFZqw5ahYrR9jD96yDbbDNTdKtNqRbze6oTDLntrsANgQKZu', 
    weight: 1 
  }],
  waits: []
};

const updateauth_input = {
  account: 'useraaaaaaaa',
  permission: 'my_new_permission',
  parent: 'active',
  auth: authorization_object
};

(async () => {
  await api.transact({
    actions: [
    {
      account: 'eosio',
      name: 'updateauth',
      authorization: [{
        actor: 'useraaaaaaaa',
        permission: 'active',
      }],
      data: updateauth_input,
    }]
  }, {
    blocksBehind: 3,
    expireSeconds: 30,
  });
})();

You can check that the new permission exists on the account using get_account