signature/policy_config.go
func (p *Policy) UnmarshalJSON(data []byte) error {
	*p = Policy{}
	transports := policyTransportsMap{}
	if err := paranoidUnmarshalJSONObject(data, func(key string) interface{} {
		switch key {
		case "default":
			return &p.Default
		case "transports":
			return &transports
		default:
			return nil
		}
	}); err != nil {
		return err
	}

	if p.Default == nil {
		return InvalidPolicyFormatError("Default policy is missing")
	}
	p.Transports = map[string]PolicyTransportScopes(transports)
	return nil
}
func (p *Policy) UnmarshalJSON(data []byte) error {
	*p = Policy{}
	transports := policyTransportsMap{}
	if err := paranoidUnmarshalJSONObject(data, func(key string) interface{} {
		switch key {
		case "default":
			return &p.Default
		case "transports":
			return &transports
		default:
			return nil
		}
	}); err != nil {
		return err
	}

	if p.Default == nil {
		return InvalidPolicyFormatError("Default policy is missing")
	}
	p.Transports = map[string]PolicyTransportScopes(transports)
	return nil
}
// UnmarshalJSON implements the json.Unmarshaler interface.