diff --git a/api/request.go b/api/request.go
index 6fd8cc2..0461ed8 100644
--- a/api/request.go
+++ b/api/request.go
@@ -5,15 +5,15 @@ import (
 	"strings"
 )
 
-// RequestParam defines input parameters of an api request
-type RequestParam map[string]interface{}
-
 // Request represents an API request i.e. HTTP
 type Request struct {
 	// corresponds to the list of uri components
 	//  featured in the request URI
 	URI []string
 
+	// Scope from the configuration file of the current service
+	Scope [][]string
+
 	// original HTTP request
 	Request *http.Request
 
@@ -31,6 +31,7 @@ func NewRequest(req *http.Request) (*Request, error) {
 	// 3. Init request
 	inst := &Request{
 		URI:     uriparts,
+		Scope:   nil,
 		Request: req,
 		Param:   make(RequestParam),
 	}
diff --git a/api/request.param.go b/api/request.param.go
new file mode 100644
index 0000000..7eff378
--- /dev/null
+++ b/api/request.param.go
@@ -0,0 +1,33 @@
+package api
+
+// ConstError is a wrapper to set constant errors
+type ConstError string
+
+// Error implements error
+func (err ConstError) Error() string {
+	return string(err)
+}
+
+// ErrReqParamNotFound is thrown when a request parameter is not found
+const ErrReqParamNotFound = ConstError("request parameter not found")
+
+// ErrReqParamNotType is thrown when a request parameter is not asked with the right type
+const ErrReqParamNotType = ConstError("request parameter does not fulfills type")
+
+// RequestParam defines input parameters of an api request
+type RequestParam map[string]interface{}
+
+// GetString returns a string and an error if not found or string
+func (rp RequestParam) GetString(key string) (string, error) {
+	rawValue, found := rp[key]
+	if !found {
+		return "", ErrReqParamNotFound
+	}
+
+	convertedValue, canConvert := rawValue.(string)
+	if !canConvert {
+		return "", ErrReqParamNotType
+	}
+
+	return convertedValue, nil
+}
diff --git a/server.go b/server.go
index 18b7584..9ab6d85 100644
--- a/server.go
+++ b/server.go
@@ -45,12 +45,6 @@ func New(configPath string) (*Server, error) {
 		return nil, err
 	}
 
-	/* 3. Load type registry */
-	// TODO: add methods on the checker to set types programmatically
-
-	/* 4. Load middleware registry */
-	// TODO: add methods to set them manually
-
 	return i, nil
 
 }
@@ -73,9 +67,9 @@ func (s *Server) ServeHTTP(res http.ResponseWriter, req *http.Request) {
 	}
 	servicePath := strings.Join(apiRequest.URI[:pathIndex], "/")
 
-	// 3. check if matching method exists in config */
-	var method = serviceDef.Method(req.Method)
-	if method == nil {
+	// 3. check if matching methodDef exists in config */
+	var methodDef = serviceDef.Method(req.Method)
+	if methodDef == nil {
 		httpError(res, api.ErrorUnknownMethod())
 		return
 	}
@@ -85,7 +79,7 @@ func (s *Server) ServeHTTP(res http.ResponseWriter, req *http.Request) {
 
 	/* (4) Check parameters
 	---------------------------------------------------------*/
-	parameters, paramError := s.extractParameters(store, method.Parameters)
+	parameters, paramError := s.extractParameters(store, methodDef.Parameters)
 
 	// Fail if argument check failed
 	if paramError.Code != api.ErrorSuccess().Code {
@@ -121,6 +115,9 @@ func (s *Server) ServeHTTP(res http.ResponseWriter, req *http.Request) {
 
 	/* (6) Execute handler and return response
 	---------------------------------------------------------*/
+	// 1. feed request with configuration scope
+	apiRequest.Scope = methodDef.Permission
+
 	// 1. execute
 	apiResponse := api.NewResponse()
 	serviceHandler.Handle(*apiRequest, apiResponse)