diff --git a/internal/service/handlers/delete_user.go b/internal/service/handlers/delete_user.go
index 8363193..dd58ff5 100644
--- a/internal/service/handlers/delete_user.go
+++ b/internal/service/handlers/delete_user.go
@@ -8,7 +8,7 @@ import (
 )
 
 func DeleteUser(w http.ResponseWriter, r *http.Request) {
-	userID, err := requests.DeleteUserByID(r)
+	userID, err := requests.GetPathUserID(r)
 	if err != nil {
 		ape.RenderErr(w, problems.BadRequest(err)...)
 		return
diff --git a/internal/service/handlers/get_proof.go b/internal/service/handlers/get_proof.go
index 53cd91c..a32609b 100644
--- a/internal/service/handlers/get_proof.go
+++ b/internal/service/handlers/get_proof.go
@@ -1,15 +1,16 @@
 package handlers
 
 import (
+	"net/http"
+
 	"github.com/rarimo/verificator-svc/internal/service/requests"
 	"github.com/rarimo/verificator-svc/internal/service/responses"
 	"gitlab.com/distributed_lab/ape"
 	"gitlab.com/distributed_lab/ape/problems"
-	"net/http"
 )
 
 func GetProofByUserID(w http.ResponseWriter, r *http.Request) {
-	userID, err := requests.GetProofByUserID(r)
+	userID, err := requests.GetPathUserID(r)
 	if err != nil {
 		ape.RenderErr(w, problems.BadRequest(err)...)
 		return
diff --git a/internal/service/handlers/get_user.go b/internal/service/handlers/get_user.go
index e905c30..05d6e54 100644
--- a/internal/service/handlers/get_user.go
+++ b/internal/service/handlers/get_user.go
@@ -1,15 +1,16 @@
 package handlers
 
 import (
+	"net/http"
+
 	"github.com/rarimo/verificator-svc/internal/service/requests"
 	"github.com/rarimo/verificator-svc/internal/service/responses"
 	"gitlab.com/distributed_lab/ape"
 	"gitlab.com/distributed_lab/ape/problems"
-	"net/http"
 )
 
 func GetUser(w http.ResponseWriter, r *http.Request) {
-	userID, err := requests.DeleteUserByID(r)
+	userID, err := requests.GetPathUserID(r)
 	if err != nil {
 		ape.RenderErr(w, problems.BadRequest(err)...)
 		return
diff --git a/internal/service/handlers/get_verification_status.go b/internal/service/handlers/get_verification_status.go
index a7341c5..f3529ad 100644
--- a/internal/service/handlers/get_verification_status.go
+++ b/internal/service/handlers/get_verification_status.go
@@ -1,15 +1,16 @@
 package handlers
 
 import (
+	"net/http"
+
 	"github.com/rarimo/verificator-svc/internal/service/requests"
 	"github.com/rarimo/verificator-svc/internal/service/responses"
 	"gitlab.com/distributed_lab/ape"
 	"gitlab.com/distributed_lab/ape/problems"
-	"net/http"
 )
 
 func GetVerificationStatusById(w http.ResponseWriter, r *http.Request) {
-	userID, err := requests.GetVerificationStatusByID(r)
+	userID, err := requests.GetPathUserID(r)
 	if err != nil {
 		ape.RenderErr(w, problems.BadRequest(err)...)
 		return
diff --git a/internal/service/handlers/proof_params.go b/internal/service/handlers/proof_params.go
index bfde766..b5ee2fe 100644
--- a/internal/service/handlers/proof_params.go
+++ b/internal/service/handlers/proof_params.go
@@ -13,7 +13,7 @@ import (
 )
 
 func GetProofParamsById(w http.ResponseWriter, r *http.Request) {
-	userIDHash, err := requests.GetProofParamsByID(r)
+	userIDHash, err := requests.GetPathUserIDHash(r)
 	if err != nil {
 		ape.RenderErr(w, problems.BadRequest(err)...)
 		return
diff --git a/internal/service/handlers/proof_params_light.go b/internal/service/handlers/proof_params_light.go
index 85b25ca..6df9f01 100644
--- a/internal/service/handlers/proof_params_light.go
+++ b/internal/service/handlers/proof_params_light.go
@@ -13,7 +13,7 @@ import (
 )
 
 func GetProofParamsLightById(w http.ResponseWriter, r *http.Request) {
-	userIDHash, err := requests.GetProofParamsByID(r)
+	userIDHash, err := requests.GetPathUserIDHash(r)
 	if err != nil {
 		ape.RenderErr(w, problems.BadRequest(err)...)
 		return
diff --git a/internal/service/requests/get_proof_parameters.go b/internal/service/requests/get_proof_parameters.go
index 84712ed..9ceda7e 100644
--- a/internal/service/requests/get_proof_parameters.go
+++ b/internal/service/requests/get_proof_parameters.go
@@ -2,10 +2,12 @@ package requests
 
 import (
 	"fmt"
+	"net/http"
+	"strings"
+
 	val "github.com/go-ozzo/ozzo-validation/v4"
 	"github.com/go-ozzo/ozzo-validation/v4/is"
 	"gitlab.com/distributed_lab/urlval/v4"
-	"net/http"
 )
 
 type UserInputs struct {
@@ -21,14 +23,16 @@ func NewGetUserInputs(r *http.Request) (userInputs UserInputs, err error) {
 		err = newDecodeError("query", err)
 		return
 	}
+
+	userInputs.UserId = strings.ToLower(userInputs.UserId)
+
 	err = val.Errors{
-		"user_id":         val.Validate(userInputs.UserId, val.Required, is.Email),
+		"user_id":         val.Validate(userInputs.UserId, val.Required),
 		"age_lower_bound": val.Validate(userInputs.AgeLowerBound, val.Required),
 		"uniqueness":      val.Validate(val.Required),
 		"nationality":     val.Validate(userInputs.Nationality, val.Required),
 		"event_id":        val.Validate(userInputs.EventID, is.Hexadecimal),
-	}.
-		Filter()
+	}.Filter()
 	return
 }
 
diff --git a/internal/service/requests/user_id_hash_path.go b/internal/service/requests/user_id_hash_path.go
new file mode 100644
index 0000000..623e2d6
--- /dev/null
+++ b/internal/service/requests/user_id_hash_path.go
@@ -0,0 +1,17 @@
+package requests
+
+import (
+	"net/http"
+
+	"github.com/go-chi/chi"
+	val "github.com/go-ozzo/ozzo-validation/v4"
+)
+
+func GetPathUserIDHash(r *http.Request) (userIdHash string, err error) {
+	userIdHash = chi.URLParam(r, "user_id_hash")
+
+	err = val.Errors{
+		"user_id": val.Validate(userIdHash, val.Required),
+	}.Filter()
+	return
+}
diff --git a/internal/service/requests/get_verification_status.go b/internal/service/requests/user_id_path.go
similarity index 61%
rename from internal/service/requests/get_verification_status.go
rename to internal/service/requests/user_id_path.go
index aa60fec..512125e 100644
--- a/internal/service/requests/get_verification_status.go
+++ b/internal/service/requests/user_id_path.go
@@ -2,13 +2,14 @@ package requests
 
 import (
 	"net/http"
+	"strings"
 
 	"github.com/go-chi/chi"
 	val "github.com/go-ozzo/ozzo-validation/v4"
 )
 
-func GetVerificationStatusByID(r *http.Request) (userId string, err error) {
-	userId = chi.URLParam(r, "user_id")
+func GetPathUserID(r *http.Request) (userId string, err error) {
+	userId = strings.ToLower(chi.URLParam(r, "user_id"))
 
 	err = val.Errors{
 		"user_id": val.Validate(userId, val.Required),