Verify user in admin

- If 404, user don't exist in admin, it will be anonym user
- if 403, user is ban or not associate in the world

back/src/Services/AdminApi.ts

@@ -61,6 +61,17 @@ class AdminApi {
         )
         return res.data;
     }
+
+    async fetchCheckUserByToken(organizationMemberToken: string): Promise<AdminApiData> {
+        if (!ADMIN_API_URL) {
+            return Promise.reject('No admin backoffice set!');
+        }
+        //todo: this call can fail if the corresponding world is not activated or if the token is invalid. Handle that case.
+        const res = await Axios.get(ADMIN_API_URL+'/api/check-user/'+organizationMemberToken,
+            { headers: {"Authorization" : `${ADMIN_API_TOKEN}`} }
+        )
+        return res.data;
+    }
     
     reportPlayer(reportedUserUuid: string, reportedUserComment: string, reporterUserUuid: string) {
        return Axios.post(`${ADMIN_API_URL}/api/report`, {