diff --git a/backend/src/main/java/org/bffl/controller/MainController.java b/backend/src/main/java/org/bffl/controller/MainController.java
index a246216..776b176 100644
--- a/backend/src/main/java/org/bffl/controller/MainController.java
+++ b/backend/src/main/java/org/bffl/controller/MainController.java
@@ -1,7 +1,7 @@
 package org.bffl.controller;
 
 import org.bffl.dbConnector.dao.repos.*;
-import org.bffl.dbConnector.dao.types.postParamTypes.ShortURLWithTargetAndTags;
+import org.bffl.dbConnector.dao.types.postParamTypes.*;
 import org.bffl.iamConnector.iamConfig.KeycloakSecurityConfig;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.http.HttpStatus;
@@ -11,7 +11,6 @@
 
 import javax.servlet.http.HttpServletRequest;
 import java.util.ArrayList;
-import java.util.Arrays;
 import java.util.List;
 
 @CrossOrigin(origins = {"http://localhost:4200", "https://bfflshort.de"}, maxAge = 3600L)
@@ -132,7 +131,7 @@ public ResponseEntity<List<Object>> getAllCallsOfShortURL(@RequestParam("short_u
     }
 
     @PostMapping("/createShortURLForGroupWithTags")
-    public int insertNewShortURLWithTarget(@RequestBody ShortURLWithTargetAndTags body){
+    public int insertNewShortURLWithTarget(@RequestBody POST_ShortURLWithTargetAndTags body){
 
         int modifiedRows = this.short_urlRepo.saveShortURL(body.getGroup_name(), body.getCustom_suffix(), body.getScope(), body.isDelete_flag(), body.isUpdate_flag());
         if(modifiedRows != 1) return HttpStatus.BAD_REQUEST.value();
@@ -156,195 +155,164 @@ public int insertNewShortURLWithTarget(@RequestBody ShortURLWithTargetAndTags bo
     }
 
     @PostMapping("/assignTagToShortURL")
-    public ResponseEntity assignTagOfGroupToShortURLByID(
-            @RequestParam("tag_id") int tag_id,
-            @RequestParam("short_url_id") int short_url_id){
+    public int assignTagOfGroupToShortURLByID(@RequestBody POST_TagToShortURLAssignment body){
 
-        int modifiedRows = this.url_has_tagRepo.saveTagOfGroupToShortURLByID(tag_id, short_url_id);
-        if(modifiedRows != 1) return new ResponseEntity(HttpStatus.BAD_REQUEST);
+        int modifiedRows = this.url_has_tagRepo.saveTagOfGroupToShortURLByID(body.getTag_id(), body.getShort_url_id());
+        if(modifiedRows != 1) return HttpStatus.BAD_REQUEST.value();
 
-        return new ResponseEntity(HttpStatus.CREATED);
+        return HttpStatus.CREATED.value();
     }
 
     @PostMapping("/createGroup")
-    public ResponseEntity createGroup(
-            @RequestParam("group_name") String group_name,
-            @RequestParam("max_size") int max_size){
+    public int createGroup(@RequestBody POST_Group body){
 
-        int modifiedRows = this.app_groupRepo.saveGroup(group_name, max_size);
-        if(modifiedRows != 1) return new ResponseEntity(HttpStatus.BAD_REQUEST);
+        int modifiedRows = this.app_groupRepo.saveGroup(body.getGroup_name(), body.getMax_size());
+        if(modifiedRows != 1) return HttpStatus.BAD_REQUEST.value();
 
-        return new ResponseEntity(HttpStatus.CREATED);
+        return HttpStatus.CREATED.value();
     }
 
     @PostMapping("/addUserToGroup")
-    public ResponseEntity assignUserToGroup(
-            @RequestParam("group_name") String group_name,
-            @RequestParam("user_id") String user_id,
-            @RequestParam("end_timestamp") Integer end_timestamp){
+    public int assignUserToGroup(@RequestBody POST_UserToGroupAssignment body){
 
-        int modifiedRows = this.user_has_groupRepo.saveUserAssignToGroup(group_name, user_id, end_timestamp);
-        if(modifiedRows != 1) return new ResponseEntity(HttpStatus.BAD_REQUEST);
+        int modifiedRows = this.user_has_groupRepo.saveUserAssignToGroup(body.getGroup_name(), body.getUser_id(), body.getEnd_timestamp());
+        if(modifiedRows != 1) return HttpStatus.BAD_REQUEST.value();
 
-        return new ResponseEntity(HttpStatus.CREATED);
+        return HttpStatus.CREATED.value();
     }
 
     @PostMapping("/addUserAsAdminToGroup")
-    public ResponseEntity assignUserAsAdminToGroup(
-            HttpServletRequest request,
-            @RequestParam("group_name") String group_name,
-            @RequestParam("new_user_id") String new_user_id,
-            @RequestParam("end_timestamp") Integer end_timestamp){
+    public int assignUserAsAdminToGroup(@RequestBody POST_UserToGroupAssignment body, HttpServletRequest request){
 
         String groupmember_user_id = KeycloakSecurityConfig.getAccessToken(request).getSubject();
 
-        int modifiedRows = this.user_has_groupRepo.saveUserAssignAsAdminToGroup(groupmember_user_id, group_name, new_user_id, end_timestamp);
-        if(modifiedRows != 1) return new ResponseEntity(HttpStatus.BAD_REQUEST);
+        int modifiedRows = this.user_has_groupRepo.saveUserAssignAsAdminToGroup(groupmember_user_id, body.getGroup_name(), body.getUser_id(), body.getEnd_timestamp());
+        if(modifiedRows != 1) return HttpStatus.BAD_REQUEST.value();
 
-        return new ResponseEntity(HttpStatus.CREATED);
+        return HttpStatus.CREATED.value();
     }
 
     @PostMapping("/updateShortURL")
-    public ResponseEntity updateAttributesOfShortURL(
-            @RequestParam("short_url_id") int short_url_id,
-            @RequestParam("custom_suffix") String custom_suffix,
-            @RequestParam("scope") int scope,
-            @RequestParam("delete_flag") Boolean delete_flag,
-            @RequestParam("update_flag") Boolean update_flag,
-            @RequestParam("target_url") String target_url){
+    public int updateAttributesOfShortURL(@RequestBody POST_ShortURL body){
 
         int modifiedRows = 0;
 
-        if(custom_suffix != null && custom_suffix.length() > 0){
-            modifiedRows = this.short_urlRepo.updateSuffixOfShortURL(short_url_id, custom_suffix);
+        if(body.getCustom_suffix() != null && body.getCustom_suffix().length() > 0){
+            modifiedRows = this.short_urlRepo.updateSuffixOfShortURL(body.getShort_url_id(), body.getCustom_suffix());
         }
-        if(modifiedRows < 1) return new ResponseEntity(HttpStatus.BAD_REQUEST);
+        if(modifiedRows < 1) return HttpStatus.BAD_REQUEST.value();
 
-        if(scope >= (System.currentTimeMillis() / 1000) + 3600){
-            modifiedRows = this.short_urlRepo.updateScopeOfShortURL(short_url_id, scope);
+        if(body.getScope() >= (System.currentTimeMillis() / 1000) + 3600){
+            modifiedRows = this.short_urlRepo.updateScopeOfShortURL(body.getShort_url_id(), body.getScope());
         }
-        if(modifiedRows < 1) return new ResponseEntity(HttpStatus.BAD_REQUEST);
+        if(modifiedRows < 1) return HttpStatus.BAD_REQUEST.value();
 
-        if(delete_flag != null){
-            modifiedRows = this.short_urlRepo.updateDeleteFlagOfShortURL(short_url_id, delete_flag);
+        if(body.getDelete_flag() != null){
+            modifiedRows = this.short_urlRepo.updateDeleteFlagOfShortURL(body.getShort_url_id(), body.getDelete_flag());
         }
-        if(modifiedRows < 1) return new ResponseEntity(HttpStatus.BAD_REQUEST);
+        if(modifiedRows < 1) return HttpStatus.BAD_REQUEST.value();
 
-        if(update_flag != null){
-            modifiedRows = this.short_urlRepo.updateUpdateFlagOfShortURL(short_url_id, update_flag);
+        if(body.getUpdate_flag() != null){
+            modifiedRows = this.short_urlRepo.updateUpdateFlagOfShortURL(body.getShort_url_id(), body.getUpdate_flag());
         }
-        if(modifiedRows < 1) return new ResponseEntity(HttpStatus.BAD_REQUEST);
+        if(modifiedRows < 1) return HttpStatus.BAD_REQUEST.value();
 
-        if(target_url != null && target_url.length() > 0){
-            modifiedRows = this.assigned_targetRepo.saveNewTargetOfShortURL(short_url_id, target_url);
+        if(body.getTarget_url() != null && body.getTarget_url().length() > 0){
+            modifiedRows = this.assigned_targetRepo.saveNewTargetOfShortURL(body.getShort_url_id(), body.getTarget_url());
         }
-        if(modifiedRows < 1) return new ResponseEntity(HttpStatus.BAD_REQUEST);
+        if(modifiedRows < 1) return HttpStatus.BAD_REQUEST.value();
 
-        return new ResponseEntity(HttpStatus.OK);
+        return HttpStatus.OK.value();
     }
 
     @PostMapping("/updateTag")
-    public ResponseEntity updateAttributesOfShortURL(
-            @RequestParam("tag_id") int tag_id,
-            @RequestParam("title") String title,
-            @RequestParam("description") String description,
-            @RequestParam("color") String color){
+    public int updateAttributesOfTag(@RequestBody POST_Tag body){
 
         int modifiedRows = 0;
 
-        if(title != null && title.length() > 0){
-            modifiedRows = this.tagRepo.updateTitleOfTag(tag_id, title);
+        if(body.getTitle() != null && body.getTitle().length() > 0){
+            modifiedRows = this.tagRepo.updateTitleOfTag(body.getTag_id(), body.getTitle());
         }
-        if(modifiedRows < 1) return new ResponseEntity(HttpStatus.BAD_REQUEST);
+        if(modifiedRows < 1) return HttpStatus.BAD_REQUEST.value();
 
-        if(description != null && description.length() > 0){
-            modifiedRows = this.tagRepo.updateDescriptionOfTag(tag_id, description);
+        if(body.getDescription() != null && body.getDescription().length() > 0){
+            modifiedRows = this.tagRepo.updateDescriptionOfTag(body.getTag_id(), body.getDescription());
         }
-        if(modifiedRows < 1) return new ResponseEntity(HttpStatus.BAD_REQUEST);
+        if(modifiedRows < 1) return HttpStatus.BAD_REQUEST.value();
 
-        if(color != null && color.length() == 6){
-            modifiedRows = this.tagRepo.updateColorOfTag(tag_id, color);
+        if(body.getColor() != null && body.getColor().length() == 6){
+            modifiedRows = this.tagRepo.updateColorOfTag(body.getTag_id(), body.getColor());
         }
-        if(modifiedRows < 1) return new ResponseEntity(HttpStatus.BAD_REQUEST);
+        if(modifiedRows < 1) return HttpStatus.BAD_REQUEST.value();
 
-        return new ResponseEntity(HttpStatus.OK);
+        return HttpStatus.OK.value();
     }
 
     @PostMapping("/updateGroupSize")
-    public ResponseEntity updateAttributesOfShortURL(
-            @RequestParam("group_name") String group_name,
-            @RequestParam("max_size") int max_size){
+    public int updateGroupSize(@RequestBody POST_Group body){
 
-        int modifiedRows = this.app_groupRepo.updateMaxSizeOfGroup(group_name, max_size);
-        if(modifiedRows < 1) return new ResponseEntity(HttpStatus.BAD_REQUEST);
+        int modifiedRows = this.app_groupRepo.updateMaxSizeOfGroup(body.getGroup_name(), body.getMax_size());
+        if(modifiedRows < 1) return HttpStatus.BAD_REQUEST.value();
 
-        return new ResponseEntity(HttpStatus.OK);
+        return HttpStatus.OK.value();
     }
 
     @PostMapping("/updateUserOfGroupAssignment")
-    public ResponseEntity updateAdminStateOfUser(
-            HttpServletRequest request,
-            @RequestParam("group_name") String group_name,
-            @RequestParam("searched_user_id") String searched_user_id,
-            @RequestParam("end_timestamp") Integer end_timestamp,
-            @RequestParam("admin_flag") Boolean admin_flag){
+    public int updateAdminStateOfUser(@RequestBody POST_AdminToGroupAssignment body, HttpServletRequest request){
 
         String groupmember_user_id = KeycloakSecurityConfig.getAccessToken(request).getSubject();
         int modifiedRows = 0;
 
-        if(end_timestamp != null && end_timestamp > 0){
-            modifiedRows = this.user_has_groupRepo.updateEndTimestampOfUser(groupmember_user_id, searched_user_id, group_name, end_timestamp);
+        if(body.getEnd_timestamp() != null && body.getEnd_timestamp() > 0){
+            modifiedRows = this.user_has_groupRepo.updateEndTimestampOfUser(groupmember_user_id, body.getUser_id(), body.getGroup_name(), body.getEnd_timestamp());
         }
-        if(modifiedRows < 1) return new ResponseEntity(HttpStatus.BAD_REQUEST);
+        if(modifiedRows < 1) return HttpStatus.BAD_REQUEST.value();
 
-        if(admin_flag != null){
-            modifiedRows = this.user_has_groupRepo.updateAdminStateOfUser(groupmember_user_id, group_name, searched_user_id, admin_flag);
+        if(body.getAdmin_flag() != null){
+            modifiedRows = this.user_has_groupRepo.updateAdminStateOfUser(groupmember_user_id, body.getGroup_name(), body.getUser_id(), body.getAdmin_flag());
         }
-        if(modifiedRows < 1) return new ResponseEntity(HttpStatus.BAD_REQUEST);
+        if(modifiedRows < 1) return HttpStatus.BAD_REQUEST.value();
 
-        return new ResponseEntity(HttpStatus.OK);
+        return HttpStatus.OK.value();
 
     }
 
     @PostMapping("/deleteUserFromGroup")
-    public ResponseEntity deleteUserOfGroupAssignment(
-            HttpServletRequest request,
-            @RequestParam("group_name") String group_name,
-            @RequestParam("searched_user_id") String searched_user_id){
+    public int deleteUserOfGroupAssignment(@RequestBody POST_UserToGroupAssignmentWithoutTimestamp body, HttpServletRequest request){
 
         String groupmember_user_id = KeycloakSecurityConfig.getAccessToken(request).getSubject();
 
-        int removedRows = this.user_has_groupRepo.deleteUserOfGroupAssignment(groupmember_user_id, searched_user_id, group_name);
-        if(removedRows < 1) return new ResponseEntity(HttpStatus.BAD_REQUEST);
+        int modifiedRows = this.user_has_groupRepo.deleteUserOfGroupAssignment(groupmember_user_id, body.getUser_id(), body.getGroup_name());
+        if(modifiedRows < 1) return HttpStatus.BAD_REQUEST.value();
 
-        return new ResponseEntity(HttpStatus.OK);
+        return HttpStatus.OK.value();
 
     }
 
     @PostMapping("/deleteShortURL")
-    public ResponseEntity deleteShortURLByID(@RequestParam("short_url_id") int short_url_id){
+    public int deleteShortURLByID(@RequestBody POST_ShortURLId body){
 
-        int modifiedRows = this.short_urlRepo.deleteShortURL(short_url_id);
-        if(modifiedRows < 1) return new ResponseEntity(HttpStatus.BAD_REQUEST);
+        int modifiedRows = this.short_urlRepo.deleteShortURL(body.getShort_url_id());
+        if(modifiedRows < 1) return HttpStatus.BAD_REQUEST.value();
 
-        return new ResponseEntity(HttpStatus.OK);
+        return HttpStatus.OK.value();
     }
 
     @PostMapping("/deleteTag")
-    public ResponseEntity deleteTagByID(@RequestParam("tag_id") int tag_id){
+    public int deleteTagByID(@RequestBody POST_TagId body){
 
-        int modifiedRows = this.tagRepo.deleteTagById(tag_id);
-        if(modifiedRows < 1) return new ResponseEntity(HttpStatus.BAD_REQUEST);
+        int modifiedRows = this.tagRepo.deleteTagById(body.getTag_id());
+        if(modifiedRows < 1) return HttpStatus.BAD_REQUEST.value();
 
-        return new ResponseEntity(HttpStatus.OK);
+        return HttpStatus.OK.value();
     }
 
     @PostMapping("/deleteGroup")
-    public ResponseEntity deleteGroupByID(@RequestParam("group_name") String group_name){
+    public int deleteGroupByID(@RequestBody POST_GroupName body){
 
-        int modifiedRows = this.app_groupRepo.deleteGroupById(group_name);
-        if(modifiedRows < 1) return new ResponseEntity(HttpStatus.BAD_REQUEST);
+        int modifiedRows = this.app_groupRepo.deleteGroupById(body.getGroup_name());
+        if(modifiedRows < 1) return HttpStatus.BAD_REQUEST.value();
 
-        return new ResponseEntity(HttpStatus.OK);
+        return HttpStatus.OK.value();
     }
 }
diff --git a/backend/src/main/java/org/bffl/dbConnector/dao/types/postParamTypes/POST_AdminToGroupAssignment.java b/backend/src/main/java/org/bffl/dbConnector/dao/types/postParamTypes/POST_AdminToGroupAssignment.java
new file mode 100644
index 0000000..c96dab9
--- /dev/null
+++ b/backend/src/main/java/org/bffl/dbConnector/dao/types/postParamTypes/POST_AdminToGroupAssignment.java
@@ -0,0 +1,24 @@
+package org.bffl.dbConnector.dao.types.postParamTypes;
+
+import lombok.Getter;
+import lombok.Setter;
+
+@Getter
+@Setter
+public class POST_AdminToGroupAssignment {
+
+    private String group_name;
+    private String user_id;
+    private Integer end_timestamp;
+    private Boolean admin_flag;
+
+    public POST_AdminToGroupAssignment(String group_name, String user_id, Integer end_timestamp, Boolean admin_flag) {
+        this.group_name = group_name;
+        this.user_id = user_id;
+        this.admin_flag = admin_flag;
+        int currentTime = (int) System.currentTimeMillis() / 1000 + 3600;
+        if(end_timestamp < currentTime)
+            end_timestamp = currentTime;
+        this.end_timestamp = end_timestamp;
+    }
+}
diff --git a/backend/src/main/java/org/bffl/dbConnector/dao/types/postParamTypes/POST_Group.java b/backend/src/main/java/org/bffl/dbConnector/dao/types/postParamTypes/POST_Group.java
new file mode 100644
index 0000000..949ad4f
--- /dev/null
+++ b/backend/src/main/java/org/bffl/dbConnector/dao/types/postParamTypes/POST_Group.java
@@ -0,0 +1,19 @@
+package org.bffl.dbConnector.dao.types.postParamTypes;
+
+import lombok.Getter;
+import lombok.Setter;
+
+@Getter
+@Setter
+public class POST_Group {
+
+    private String group_name;
+    private int max_size;
+
+    public POST_Group(String group_name, int max_size) {
+        this.group_name = group_name;
+        if(max_size < 1)
+            max_size = 1;
+        this.max_size = max_size;
+    }
+}
diff --git a/backend/src/main/java/org/bffl/dbConnector/dao/types/postParamTypes/POST_GroupName.java b/backend/src/main/java/org/bffl/dbConnector/dao/types/postParamTypes/POST_GroupName.java
new file mode 100644
index 0000000..2f0f40d
--- /dev/null
+++ b/backend/src/main/java/org/bffl/dbConnector/dao/types/postParamTypes/POST_GroupName.java
@@ -0,0 +1,14 @@
+package org.bffl.dbConnector.dao.types.postParamTypes;
+
+import lombok.AllArgsConstructor;
+import lombok.Getter;
+import lombok.Setter;
+
+@Getter
+@Setter
+@AllArgsConstructor
+public class POST_GroupName {
+
+    private String group_name;
+
+}
diff --git a/backend/src/main/java/org/bffl/dbConnector/dao/types/postParamTypes/POST_ShortURL.java b/backend/src/main/java/org/bffl/dbConnector/dao/types/postParamTypes/POST_ShortURL.java
new file mode 100644
index 0000000..9b01c2c
--- /dev/null
+++ b/backend/src/main/java/org/bffl/dbConnector/dao/types/postParamTypes/POST_ShortURL.java
@@ -0,0 +1,19 @@
+package org.bffl.dbConnector.dao.types.postParamTypes;
+
+import lombok.AllArgsConstructor;
+import lombok.Getter;
+import lombok.Setter;
+
+@Getter
+@Setter
+@AllArgsConstructor
+public class POST_ShortURL {
+
+    private int short_url_id;
+    private String custom_suffix;
+    private int scope;
+    private Boolean delete_flag;
+    private Boolean update_flag;
+    private String target_url;
+
+}
diff --git a/backend/src/main/java/org/bffl/dbConnector/dao/types/postParamTypes/POST_ShortURLId.java b/backend/src/main/java/org/bffl/dbConnector/dao/types/postParamTypes/POST_ShortURLId.java
new file mode 100644
index 0000000..4dd0b5b
--- /dev/null
+++ b/backend/src/main/java/org/bffl/dbConnector/dao/types/postParamTypes/POST_ShortURLId.java
@@ -0,0 +1,14 @@
+package org.bffl.dbConnector.dao.types.postParamTypes;
+
+import lombok.AllArgsConstructor;
+import lombok.Getter;
+import lombok.Setter;
+
+@Getter
+@Setter
+@AllArgsConstructor
+public class POST_ShortURLId {
+
+    private int short_url_id;
+
+}
diff --git a/backend/src/main/java/org/bffl/dbConnector/dao/types/postParamTypes/ShortURLWithTargetAndTags.java b/backend/src/main/java/org/bffl/dbConnector/dao/types/postParamTypes/POST_ShortURLWithTargetAndTags.java
similarity index 66%
rename from backend/src/main/java/org/bffl/dbConnector/dao/types/postParamTypes/ShortURLWithTargetAndTags.java
rename to backend/src/main/java/org/bffl/dbConnector/dao/types/postParamTypes/POST_ShortURLWithTargetAndTags.java
index fb0ec59..cbd4906 100644
--- a/backend/src/main/java/org/bffl/dbConnector/dao/types/postParamTypes/ShortURLWithTargetAndTags.java
+++ b/backend/src/main/java/org/bffl/dbConnector/dao/types/postParamTypes/POST_ShortURLWithTargetAndTags.java
@@ -5,7 +5,7 @@
 
 @Getter
 @Setter
-public class ShortURLWithTargetAndTags {
+public class POST_ShortURLWithTargetAndTags {
     private String group_name;
     private String custom_suffix;
     private int scope;
@@ -14,13 +14,13 @@ public class ShortURLWithTargetAndTags {
     private String target_url;
     private Integer[] assigned_tag_ids;
 
-    public ShortURLWithTargetAndTags(String group_name,
-                                     String custom_suffix,
-                                     int scope,
-                                     boolean delete_flag,
-                                     boolean update_flag,
-                                     String target_url,
-                                     String[] assigned_tag_ids){
+    public POST_ShortURLWithTargetAndTags(String group_name,
+                                          String custom_suffix,
+                                          int scope,
+                                          boolean delete_flag,
+                                          boolean update_flag,
+                                          String target_url,
+                                          String[] assigned_tag_ids){
 
         this.group_name = group_name;
         this.custom_suffix = custom_suffix;
diff --git a/backend/src/main/java/org/bffl/dbConnector/dao/types/postParamTypes/POST_Tag.java b/backend/src/main/java/org/bffl/dbConnector/dao/types/postParamTypes/POST_Tag.java
new file mode 100644
index 0000000..f828b79
--- /dev/null
+++ b/backend/src/main/java/org/bffl/dbConnector/dao/types/postParamTypes/POST_Tag.java
@@ -0,0 +1,43 @@
+package org.bffl.dbConnector.dao.types.postParamTypes;
+
+import lombok.Getter;
+import lombok.Setter;
+
+@Getter
+@Setter
+public class POST_Tag {
+
+    private int tag_id;
+    private String title;
+    private String description;
+    private String color;
+
+    public POST_Tag(int tag_id, String title, String description, String color) {
+        this.tag_id = tag_id;
+        this.title = title;
+        this.description = description;
+        this.color = color;
+    }
+
+    private boolean isColorCode(String color){
+        if(color.length() != 6)
+            return false;
+
+        for (int i = 0; i < color.length(); i++) {
+            if(!isHex(color))
+                return false;
+        }
+
+        return true;
+    }
+
+    private boolean isHex(String color){
+        try{
+            Long.parseLong(color, 16);
+            return true;
+        } catch (Exception e) {
+            e.printStackTrace();
+            return false;
+        }
+    }
+}
diff --git a/backend/src/main/java/org/bffl/dbConnector/dao/types/postParamTypes/POST_TagId.java b/backend/src/main/java/org/bffl/dbConnector/dao/types/postParamTypes/POST_TagId.java
new file mode 100644
index 0000000..4679374
--- /dev/null
+++ b/backend/src/main/java/org/bffl/dbConnector/dao/types/postParamTypes/POST_TagId.java
@@ -0,0 +1,14 @@
+package org.bffl.dbConnector.dao.types.postParamTypes;
+
+import lombok.AllArgsConstructor;
+import lombok.Getter;
+import lombok.Setter;
+
+@Getter
+@Setter
+@AllArgsConstructor
+public class POST_TagId {
+
+    private int tag_id;
+
+}
diff --git a/backend/src/main/java/org/bffl/dbConnector/dao/types/postParamTypes/POST_TagToShortURLAssignment.java b/backend/src/main/java/org/bffl/dbConnector/dao/types/postParamTypes/POST_TagToShortURLAssignment.java
new file mode 100644
index 0000000..1f1c50a
--- /dev/null
+++ b/backend/src/main/java/org/bffl/dbConnector/dao/types/postParamTypes/POST_TagToShortURLAssignment.java
@@ -0,0 +1,15 @@
+package org.bffl.dbConnector.dao.types.postParamTypes;
+
+import lombok.AllArgsConstructor;
+import lombok.Getter;
+import lombok.Setter;
+
+@AllArgsConstructor
+@Getter
+@Setter
+public class POST_TagToShortURLAssignment {
+
+    private int tag_id;
+    private  int short_url_id;
+
+}
diff --git a/backend/src/main/java/org/bffl/dbConnector/dao/types/postParamTypes/POST_UserToGroupAssignment.java b/backend/src/main/java/org/bffl/dbConnector/dao/types/postParamTypes/POST_UserToGroupAssignment.java
new file mode 100644
index 0000000..c8e09bb
--- /dev/null
+++ b/backend/src/main/java/org/bffl/dbConnector/dao/types/postParamTypes/POST_UserToGroupAssignment.java
@@ -0,0 +1,22 @@
+package org.bffl.dbConnector.dao.types.postParamTypes;
+
+import lombok.Getter;
+import lombok.Setter;
+
+@Getter
+@Setter
+public class POST_UserToGroupAssignment {
+
+    private String group_name;
+    private String user_id;
+    private Integer end_timestamp;
+
+    public POST_UserToGroupAssignment(String group_name, String user_id, Integer end_timestamp) {
+        this.group_name = group_name;
+        this.user_id = user_id;
+        int currentTime = (int) System.currentTimeMillis() / 1000 + 3600;
+        if(end_timestamp < currentTime)
+            end_timestamp = currentTime;
+        this.end_timestamp = end_timestamp;
+    }
+}
diff --git a/backend/src/main/java/org/bffl/dbConnector/dao/types/postParamTypes/POST_UserToGroupAssignmentWithoutTimestamp.java b/backend/src/main/java/org/bffl/dbConnector/dao/types/postParamTypes/POST_UserToGroupAssignmentWithoutTimestamp.java
new file mode 100644
index 0000000..44c9fa0
--- /dev/null
+++ b/backend/src/main/java/org/bffl/dbConnector/dao/types/postParamTypes/POST_UserToGroupAssignmentWithoutTimestamp.java
@@ -0,0 +1,15 @@
+package org.bffl.dbConnector.dao.types.postParamTypes;
+
+import lombok.AllArgsConstructor;
+import lombok.Getter;
+import lombok.Setter;
+
+@Getter
+@Setter
+@AllArgsConstructor
+public class POST_UserToGroupAssignmentWithoutTimestamp {
+
+    private String group_name;
+    private String user_id;
+
+}