code: func (k *KeyringMembersClient) Post(ctx context.Context, member KeyringMember) error {
  	keyringID := member.Member.Body.KeyringID
  	members := []KeyringMember{member}
  	return k.client.RoundTrip(ctx, "POST", "/keyrings/"+keyringID.String()+"/members", nil, members, nil)
  }
docs: // Post sends a creation requests for a set of KeyringMember objects to the
  // registry.