diff --git a/src/main/java/eu/dnetlib/repo/manager/controllers/AaiUserRoleController.java b/src/main/java/eu/dnetlib/repo/manager/controllers/AaiUserRoleController.java
new file mode 100644
index 0000000..84499ea
--- /dev/null
+++ b/src/main/java/eu/dnetlib/repo/manager/controllers/AaiUserRoleController.java
@@ -0,0 +1,179 @@
+package eu.dnetlib.repo.manager.controllers;
+
+import com.google.gson.JsonArray;
+import eu.dnetlib.repo.manager.domain.dto.Role;
+import eu.dnetlib.repo.manager.service.AaiUserRoleService;
+import eu.dnetlib.repo.manager.utils.AuthorizationService;
+import eu.dnetlib.repo.manager.utils.JsonUtils;
+import org.mitre.openid.connect.model.OIDCAuthenticationToken;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.http.HttpStatus;
+import org.springframework.security.access.prepost.PreAuthorize;
+import org.springframework.security.core.context.SecurityContextHolder;
+import org.springframework.web.bind.annotation.RequestBody;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+import javax.ws.rs.*;
+import javax.ws.rs.core.MediaType;
+import javax.ws.rs.core.Response;
+
+@RestController
+@RequestMapping("/aai-user-management")
+public class AaiUserRoleController {
+
+    @Autowired
+    private AaiUserRoleService calls;
+
+    @Autowired
+    private JsonUtils jsonUtils;
+
+    // TODO: Antonis K. This should be uncommented
+//    @Autowired
+//    private AuthoritiesUpdater authoritiesUpdater;
+
+    @Autowired
+    private AuthorizationService authorizationService;
+
+    private String sendEmail() {
+        OIDCAuthenticationToken authenticationToken = (OIDCAuthenticationToken) SecurityContextHolder.getContext().getAuthentication();
+        return authenticationToken.getUserInfo().getEmail();
+    }
+
+    /**
+     * Create a new role with the given name and description.
+     **/
+    @Path("/createRole")
+    @POST
+    @Produces(MediaType.APPLICATION_JSON)
+    @Consumes(MediaType.APPLICATION_JSON)
+    @PreAuthorize("hasAnyAuthority('ROLE_USER', 'ROLE_ADMIN', 'ROLE_PROVIDE_ADMIN')") // TODO: Perhaps less roles here
+    public Response createRole(@RequestBody Role role) {
+        calls.createRole(role);
+        return Response.status(HttpStatus.OK.value()).entity(jsonUtils.createResponse("Role has been created").toString()).type(MediaType.APPLICATION_JSON).build();
+    }
+
+    /**
+     * Subscribe to a type(Community, etc.) with id(ee, egi, etc.)
+     */
+    @Path("/subscribe/{type}/{id}")
+    @POST
+    @Produces(MediaType.APPLICATION_JSON)
+    @PreAuthorize("hasAnyAuthority('ROLE_USER', 'ROLE_ADMIN', 'ROLE_PROVIDE_ADMIN')") // TODO: Perhaps less roles here
+    public Response subscribe(@PathParam("type") String type, @PathParam("id") String id) {
+        Integer coPersonId = calls.getCoPersonIdByIdentifier();
+        Integer couId = calls.getCouId(type, id);
+        if (couId != null) {
+            Integer role = calls.getRoleId(coPersonId, couId);
+            calls.assignMemberRole(coPersonId, couId, role);
+            // TODO: Antonis K. This should be uncommented to make a role DATASOURCE.OP... for every new repo
+//            authoritiesUpdater.update(sendEmail(), old -> {
+//                HashSet<SimpleGrantedAuthority> authorities = new HashSet<>((Collection<? extends SimpleGrantedAuthority>) old);
+//                authorities.add(new SimpleGrantedAuthority(authorizationService.member(type, id)));
+//                return authorities;
+//            });
+            return Response.status(HttpStatus.OK.value()).entity(jsonUtils.createResponse("Role has been assigned").toString()).type(MediaType.APPLICATION_JSON).build();
+        } else {
+            return Response.status(HttpStatus.NOT_FOUND.value()).entity(jsonUtils.createResponse("Role has not been found").toString()).type(MediaType.APPLICATION_JSON).build();
+        }
+    }
+
+
+    /**
+     * Remove the member role from user with email for a type(Community, etc.) with id(ee, egi, etc.)
+     */
+    @Path("/{type}/{id}/member/{email}")
+    @DELETE
+    @Produces(MediaType.APPLICATION_JSON)
+    @Consumes(MediaType.APPLICATION_JSON)
+    @PreAuthorize("hasAnyAuthority('ROLE_USER', 'ROLE_ADMIN', 'ROLE_PROVIDE_ADMIN')") // TODO: Perhaps less roles here
+    public Response removeMemberRole(@PathParam("type") String type, @PathParam("id") String
+            id, @PathParam("email") String email) {
+        Integer coPersonId = calls.getCoPersonIdByEmail(email);
+        if (coPersonId != null) {
+            Integer couId = calls.getCouId(type, id);
+            Integer role = null;
+            if (couId != null) {
+                role = calls.getRoleId(coPersonId, couId);
+            }
+            if (couId != null && role != null) {
+                calls.removeMemberRole(coPersonId, couId, role);
+                // TODO: Antonis K. This should be uncommented to make a role DATASOURCE.OP... for every new repo
+//                authoritiesUpdater.update(email, old -> {
+//                    HashSet<SimpleGrantedAuthority> authorities = new HashSet<>((Collection<? extends SimpleGrantedAuthority>) old);
+//                    authorities.remove(new SimpleGrantedAuthority(authorizationService.member(type, id)));
+//                    return authorities;
+//                });
+                return Response.status(HttpStatus.OK.value()).entity(jsonUtils.createResponse("Role has been removed").toString()).type(MediaType.APPLICATION_JSON).build();
+            } else {
+                return Response.status(HttpStatus.NOT_FOUND.value()).entity(jsonUtils.createResponse("Role has not been found").toString()).type(MediaType.APPLICATION_JSON).build();
+            }
+        } else {
+            return Response.status(HttpStatus.NOT_FOUND.value()).entity(jsonUtils.createResponse("User has not been found").toString()).type(MediaType.APPLICATION_JSON).build();
+        }
+    }
+
+    /**
+     * Get all the users that have the role that is associated with repoId
+     */
+    @Path("/repo/{id}/all-users")
+    @GET
+    @Produces(MediaType.APPLICATION_JSON)
+    @PreAuthorize("hasAnyAuthority('ROLE_USER', 'ROLE_ADMIN', 'ROLE_PROVIDE_ADMIN')") // TODO: Perhaps less roles here
+    public Response getAllUserOfARepo(@PathParam("id") String id) {
+
+        // find roleId by repoId
+        String roleId = calls.getRoleIdByRepoId(id, "datasource");
+
+        // find couId by role name
+        if (roleId != null) {
+            Integer couId = calls.getCouId("datasource", roleId);
+            if (couId != null) {
+                JsonArray users = calls.getUsersByCouId(couId);
+                return Response.status(HttpStatus.OK.value()).entity(jsonUtils.createResponse(users).toString()).type(MediaType.APPLICATION_JSON).build();
+            } else {
+                return Response.status(HttpStatus.NOT_FOUND.value()).entity(jsonUtils.createResponse("Role has not been found").toString()).type(MediaType.APPLICATION_JSON).build();
+            }
+        }
+
+        return Response.status(HttpStatus.NOT_FOUND.value()).entity(jsonUtils.createResponse("Role has not been found").toString()).type(MediaType.APPLICATION_JSON).build();
+    }
+
+
+    /**
+     * Subscribe to role-repo by his email
+     */
+    @Path("/subscribe/repo-role/{id}/email/{email}")
+    @POST
+    @Produces(MediaType.APPLICATION_JSON)
+    @PreAuthorize("hasAnyAuthority('ROLE_USER', 'ROLE_ADMIN', 'ROLE_PROVIDE_ADMIN')") // TODO: Perhaps less roles here
+    public Response subscribeRoleByEmail(@PathParam("id") String id, @PathParam("email") String email) {
+        Integer coPersonId = calls.getCoPersonIdByEmail(email);
+        if (coPersonId != null) {
+            String roleId = calls.getRoleIdByRepoId(id, "datasource");
+            if (roleId != null) {
+                Integer couId = calls.getCouId("datasource", roleId);
+                if (couId != null) {
+                    Integer role = calls.getRoleId(coPersonId, couId);
+                    calls.assignMemberRole(coPersonId, couId, role);
+                    // TODO: Antonis K. This should be uncommented to make a role DATASOURCE.OP... for every new repo
+//                    authoritiesUpdater.update(sendEmail(), old -> {
+//                        HashSet<SimpleGrantedAuthority> authorities = new HashSet<>((Collection<? extends SimpleGrantedAuthority>) old);
+//                        authorities.add(new SimpleGrantedAuthority(authorizationService.member("datasource", id)));
+//                        return authorities;
+//                    });
+                    return Response.status(HttpStatus.OK.value()).entity(jsonUtils.createResponse("Role has been assigned").toString()).type(MediaType.APPLICATION_JSON).build();
+                } else {
+                    return Response.status(HttpStatus.NOT_FOUND.value()).entity(jsonUtils.createResponse("Role has not been found").toString()).type(MediaType.APPLICATION_JSON).build();
+                }
+            } else {
+                return Response.status(HttpStatus.NOT_FOUND.value()).entity(jsonUtils.createResponse("Role has not been found").toString()).type(MediaType.APPLICATION_JSON).build();
+            }
+        } else {
+            return Response.status(HttpStatus.NOT_FOUND.value()).entity(jsonUtils.createResponse("User with this email has not been found").toString()).type(MediaType.APPLICATION_JSON).build();
+        }
+
+
+    }
+
+}
diff --git a/src/main/java/eu/dnetlib/repo/manager/domain/dto/Role.java b/src/main/java/eu/dnetlib/repo/manager/domain/dto/Role.java
new file mode 100644
index 0000000..e314295
--- /dev/null
+++ b/src/main/java/eu/dnetlib/repo/manager/domain/dto/Role.java
@@ -0,0 +1,32 @@
+package eu.dnetlib.repo.manager.domain.dto;
+
+import javax.xml.bind.annotation.XmlRootElement;
+
+@XmlRootElement
+public class Role {
+    String name;
+    String description;
+
+    public Role() {}
+
+    public Role(String name, String description) {
+        this.name = name;
+        this.description = description;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public String getDescription() {
+        return description;
+    }
+
+    public void setDescription(String description) {
+        this.description = description;
+    }
+}
diff --git a/src/main/java/eu/dnetlib/repo/manager/service/AaiUserRoleService.java b/src/main/java/eu/dnetlib/repo/manager/service/AaiUserRoleService.java
new file mode 100644
index 0000000..27ee3b3
--- /dev/null
+++ b/src/main/java/eu/dnetlib/repo/manager/service/AaiUserRoleService.java
@@ -0,0 +1,79 @@
+package eu.dnetlib.repo.manager.service;
+
+import com.google.gson.JsonArray;
+import eu.dnetlib.repo.manager.domain.dto.Role;
+
+public interface AaiUserRoleService {
+
+    /**
+     * 1. Get CoPersonId by Email
+     */
+    Integer getCoPersonIdByEmail(String email);
+
+    Integer getCoPersonIdByIdentifier();
+
+
+    /**
+     * 3. Get all OpenAIRE cous
+     */
+    JsonArray getCous();
+
+    /**
+     * 4. Get a couId by type.id
+     *
+     * @param type
+     * @param id
+     * @return
+     */
+    Integer getCouId(String type, String id);
+
+    /**
+     * 5. Get User non admin roles
+     */
+    JsonArray getRoles(Integer coPersonId);
+
+    /**
+     * 6. Get Role id of User base on couId.
+     */
+    Integer getRoleId(Integer coPersonId, Integer couId);
+
+    /**
+     * 16. Create a new role
+     */
+    void createRole(Role role);
+
+    /**
+     * 14. Assign a member role to a User
+     */
+    void assignMemberRole(Integer coPersonId, Integer couId, Integer id);
+
+    /**
+     * 15. Remove a member role from a User
+     */
+    void removeMemberRole(Integer coPersonId, Integer couId, Integer id);
+
+
+    /**
+     * Util function to remove the datasource prefix in role Id
+     * @param fullName
+     * @param prefix
+     * @return
+     */
+    String getRepoNameWithoutType(String fullName, String prefix);
+
+    /**
+     * Util function to transform repoId name to roleId name
+     * @param repoId
+     * @param prefix
+     * @return
+     */
+    String getRoleIdByRepoId(String repoId, String prefix);
+
+    /**
+     * 12. Get All Users that have a specific role
+     * @param couId
+     * @return
+     */
+    JsonArray getUsersByCouId(Integer couId);
+
+}
diff --git a/src/main/java/eu/dnetlib/repo/manager/service/AaiUserRoleServiceImpl.java b/src/main/java/eu/dnetlib/repo/manager/service/AaiUserRoleServiceImpl.java
new file mode 100644
index 0000000..b925ed7
--- /dev/null
+++ b/src/main/java/eu/dnetlib/repo/manager/service/AaiUserRoleServiceImpl.java
@@ -0,0 +1,225 @@
+package eu.dnetlib.repo.manager.service;
+
+import com.google.gson.JsonArray;
+import com.google.gson.JsonElement;
+import com.google.gson.JsonObject;
+import eu.dnetlib.repo.manager.domain.dto.Role;
+import eu.dnetlib.repo.manager.utils.HttpUtils;
+import eu.dnetlib.repo.manager.utils.JsonUtils;
+import org.apache.log4j.Logger;
+import org.mitre.openid.connect.model.OIDCAuthenticationToken;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.security.core.context.SecurityContextHolder;
+import org.springframework.stereotype.Service;
+
+import java.util.HashMap;
+import java.util.Map;
+
+@Service
+public class AaiUserRoleServiceImpl implements AaiUserRoleService {
+
+    private static final Logger logger = Logger.getLogger(AaiUserRoleServiceImpl.class);
+
+    @Value("2")
+    private String coid;
+
+    @Autowired
+    public HttpUtils httpUtils;
+
+    @Autowired
+    public JsonUtils jsonUtils;
+
+    private String mapType(String type) {
+        if(type.equals("datasource")) {
+            type = "datasource";
+        }
+        return type;
+    }
+
+    public String getRepoNameWithoutType(String fullName, String prefix) {
+        if ( fullName != null && prefix != null && fullName.startsWith(prefix) ) {
+            return fullName.substring(prefix.length());
+        }
+        return null;
+    }
+
+    public String getRoleIdByRepoId(String repoId, String prefix) {
+        String roleId = "";
+        if ( repoId != null && prefix != null ) {
+            roleId = prefix + "." + repoId.replaceAll(":", "$");
+            return roleId;
+        } else {
+            return null;
+        }
+
+    }
+
+    /**
+     * 1. Get CoPersonId by Email
+     * @param email
+     * @return
+     */
+    public Integer getCoPersonIdByEmail(String email) {
+        Map<String, String> params = new HashMap<>();
+        params.put("coid", coid);
+        params.put("mail", email);
+        JsonElement response = httpUtils.get("co_people.json", params);
+        if(response != null) {
+            JsonArray coPeople = response.getAsJsonObject().get("CoPeople").getAsJsonArray();
+            if(coPeople.size() > 0) {
+                return coPeople.get(0).getAsJsonObject().get("Id").getAsInt();
+            }
+        }
+        return null;
+    }
+
+    /**
+     * 2. Get CoPersonId by AAI identifier
+     */
+    public Integer getCoPersonIdByIdentifier() {
+        try {
+            OIDCAuthenticationToken authentication = (OIDCAuthenticationToken) SecurityContextHolder.getContext().getAuthentication();
+            String sub = authentication.getUserInfo().getSub();
+            Map<String, String> params = new HashMap<>();
+            params.put("coid", coid);
+            params.put("search.identifier", sub);
+            JsonElement response = httpUtils.get("co_people.json", params);
+            return (response != null) ? response.getAsJsonObject().get("CoPeople").getAsJsonArray().get(0).getAsJsonObject().get("Id").getAsInt() : null;
+        } catch (Exception e) {
+            logger.error("Get User info: An error occurred ", e);
+            return null;
+        }
+    }
+
+    /**
+     * 3. Get all OpenAIRE cous
+     */
+    public JsonArray getCous() {
+        Map<String, String> params = new HashMap<>();
+        params.put("coid", coid);
+        JsonElement response = httpUtils.get("cous.json", params);
+        return (response != null) ? response.getAsJsonObject().get("Cous").getAsJsonArray() : new JsonArray();
+    }
+
+    /**
+     * 4. Get a couId by type.id
+     *
+     * @param type
+     * @param id It is the datasourceId (e.g openaire____$$45e3c7b69bcee6cc5fa945c9e183deb9)
+     * @return
+     */
+    public Integer getCouId(String type, String id) {
+        JsonArray cous = getCous();
+        Integer couId = null;
+        for (JsonElement cou : cous) {
+            if (cou.getAsJsonObject().get("Name").getAsString().equals(mapType(type) + "." + id)) {
+                couId = cou.getAsJsonObject().get("Id").getAsInt();
+            }
+        }
+        return couId;
+    }
+
+    /**
+     * 5. Get User non admin roles
+     * @param coPersonId
+     * @return
+     */
+    public JsonArray getRoles(Integer coPersonId) {
+        Map<String, String> params = new HashMap<>();
+        params.put("copersonid", coPersonId.toString());
+        JsonElement response = httpUtils.get("co_person_roles.json", params);
+        return (response != null) ? response.getAsJsonObject().get("CoPersonRoles").getAsJsonArray() : new JsonArray();
+    }
+
+    /**
+     * 6. Get Role id of User base on couId.
+     * @param coPersonId
+     * @param couId
+     * @return
+     */
+    public Integer getRoleId(Integer coPersonId, Integer couId) {
+        JsonArray roles = getRoles(coPersonId);
+        for (JsonElement role : roles) {
+            JsonObject object = role.getAsJsonObject();
+            if (object.get("CouId").getAsInt() == couId && !object.get("Status").getAsString().equals("Deleted")) {
+                return object.get("Id").getAsInt();
+            }
+        }
+        return null;
+    }
+
+    /**
+     * 16. Create a new role
+     * @param role
+     */
+    public void createRole(Role role) {
+        httpUtils.post("cous.json", jsonUtils.createNewCou(role));
+    }
+
+    /**
+     * 14. Assign a member role to a User
+     * @param coPersonId The id of a person in OpenAIRE
+     * @param couId The id of a role in OpenAIRE (result of getCouId)
+     * @param id The id that is returned from getRoleId (role's id)
+     */
+    public void assignMemberRole(Integer coPersonId, Integer couId, Integer id) {
+        if (id != null) {
+            httpUtils.put("co_person_roles/" + id.toString() + ".json", jsonUtils.coPersonRoles(coPersonId, couId, "Active"));
+        } else {
+            httpUtils.post("co_person_roles.json", jsonUtils.coPersonRoles(coPersonId, couId, "Active"));
+        }
+    }
+
+    /**
+     * 15. Remove a member role from a User
+     * @param coPersonId The id of a person in OpenAIRE
+     * @param couId The id of a role in OpenAIRE (result of getCouId)
+     * @param id The id that is returned from getRoleId (role's id)
+     */
+    public void removeMemberRole(Integer coPersonId, Integer couId, Integer id) {
+        httpUtils.put("co_person_roles/" + id.toString() + ".json", jsonUtils.coPersonRoles(coPersonId, couId, "Deleted"));
+    }
+
+    /**
+     * 12. Get All Users that have a specific role
+     */
+    public JsonArray getUsersByCouId(Integer couId) {
+        Map<String, String> params = new HashMap<>();
+        params.put("couid", couId.toString());
+        JsonElement response = httpUtils.get("co_person_roles.json", params);
+        JsonArray infos = (response != null) ? response.getAsJsonObject().get("CoPersonRoles").getAsJsonArray() : new JsonArray();
+//        JsonArray users = new JsonArray();
+//        infos.forEach(info -> {
+//            JsonObject user = new JsonObject();
+//            user.addProperty("email", info.getAsJsonObject().get("Mail").getAsString());
+//            user.addProperty("memberSince", info.getAsJsonObject().get("Created").getAsString());
+//            emails.add(user);
+//        });
+        return infos;
+    }
+
+    /**
+     * 9. Get Groups of a Cou
+     */
+    public JsonArray getCouGroups(Integer couId) {
+        Map<String, String> params = new HashMap<>();
+        params.put("coid", coid);
+        params.put("couid", couId.toString());
+        JsonElement response = httpUtils.get("co_groups.json", params);
+        return (response != null) ? response.getAsJsonObject().get("CoGroups").getAsJsonArray() : new JsonArray();
+    }
+
+    /**
+     * 10. Get Admin Group of a Cou
+     */
+    public JsonObject getCouAdminGroup(Integer couId) {
+        JsonArray groups = getCouGroups(couId);
+        for (JsonElement group : groups) {
+            if (group.getAsJsonObject().get("Name").getAsString().contains("admins")) {
+                return group.getAsJsonObject();
+            }
+        }
+        return null;
+    }
+}
diff --git a/src/main/java/eu/dnetlib/repo/manager/utils/AuthorizationService.java b/src/main/java/eu/dnetlib/repo/manager/utils/AuthorizationService.java
new file mode 100644
index 0000000..42860a7
--- /dev/null
+++ b/src/main/java/eu/dnetlib/repo/manager/utils/AuthorizationService.java
@@ -0,0 +1,27 @@
+package eu.dnetlib.repo.manager.utils;
+
+import org.springframework.stereotype.Component;
+
+@Component("AuthorizationService")
+public class AuthorizationService {
+
+    public final String ROLE_ADMIN = "ROLE_ADMIN";
+    public final String ROLE_PROVIDE_ADMIN = "ROLE_PROVIDE_ADMIN";
+    public final String ROLE_USER = "ROLE_USER";
+
+    private String mapType(String type) {
+        if(type.equals("datasource")) {
+            type = "datasource";
+        }
+        return type;
+    }
+
+    /**
+     * Type = DATASOURCE
+     *
+     * */
+    public String member(String type, String id) {
+        return mapType(type).toUpperCase() + "_" + id.toUpperCase();
+    }
+
+}
diff --git a/src/main/java/eu/dnetlib/repo/manager/utils/DatasourceManagerClient.java b/src/main/java/eu/dnetlib/repo/manager/utils/DatasourceManagerClient.java
new file mode 100644
index 0000000..118dd05
--- /dev/null
+++ b/src/main/java/eu/dnetlib/repo/manager/utils/DatasourceManagerClient.java
@@ -0,0 +1,5 @@
+package eu.dnetlib.repo.manager.utils;
+
+public class DatasourceManagerClient {
+    //
+}
diff --git a/src/main/java/eu/dnetlib/repo/manager/utils/HttpUtils.java b/src/main/java/eu/dnetlib/repo/manager/utils/HttpUtils.java
new file mode 100644
index 0000000..d85db9c
--- /dev/null
+++ b/src/main/java/eu/dnetlib/repo/manager/utils/HttpUtils.java
@@ -0,0 +1,105 @@
+package eu.dnetlib.repo.manager.utils;
+
+import com.google.gson.JsonElement;
+import com.google.gson.JsonObject;
+import com.google.gson.JsonParser;
+import org.apache.commons.codec.binary.Base64;
+import org.apache.log4j.Logger;
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.http.*;
+import org.springframework.stereotype.Component;
+import org.springframework.web.client.RestTemplate;
+
+import java.nio.charset.Charset;
+import java.util.Map;
+
+@Component
+public class HttpUtils {
+
+    private static final Logger logger = Logger.getLogger(HttpUtils.class);
+
+    // TODO: To be changed the values
+//    @Value("https://aai.openaire.eu/registry/")
+    @Value("https://openaire-dev.aai-dev.grnet.gr/registry/")
+    private String issuer;
+
+    @Value("kostis30fylloy")
+    private String user;
+
+    @Value("fynhWc7F*2y4me4U")
+    private String password;
+
+    public JsonElement post(String path, JsonObject body) {
+        RestTemplate restTemplate = new RestTemplate();
+        HttpHeaders headers = createHeaders(user, password);
+        headers.setContentType(MediaType.APPLICATION_JSON);
+        HttpEntity<String> request = new HttpEntity<>(body.toString(), headers);
+        ResponseEntity<String> responseEntity = restTemplate.exchange(issuer + path, HttpMethod.POST, request, String.class);
+        if(responseEntity.getBody() != null) {
+            return new JsonParser().parse(responseEntity.getBody());
+        } else {
+            return null;
+        }
+    }
+
+    public JsonElement put(String path, JsonObject body) {
+        RestTemplate restTemplate = new RestTemplate();
+        HttpHeaders headers = createHeaders(user, password);
+        headers.setContentType(MediaType.APPLICATION_JSON);
+        HttpEntity<String> request = new HttpEntity<>(body.toString(), headers);
+        ResponseEntity<String> responseEntity = restTemplate.exchange(issuer + path, HttpMethod.PUT, request, String.class);
+        if(responseEntity.getBody() != null) {
+            return new JsonParser().parse(responseEntity.getBody());
+        } else {
+            return null;
+        }
+    }
+
+    public JsonElement get(String path, Map<String, String> params) {
+        RestTemplate restTemplate = new RestTemplate();
+        String url = issuer + path + ((params != null) ? createParams(params) : null);
+        ResponseEntity<String> responseEntity = restTemplate.exchange
+                (url, HttpMethod.GET, new HttpEntity<>(createHeaders(user, password)), String.class);
+        if(responseEntity.getBody() != null) {
+            return new JsonParser().parse(responseEntity.getBody());
+        } else {
+            return null;
+        }
+    }
+
+    public JsonElement delete(String path) {
+        RestTemplate restTemplate = new RestTemplate();
+        String url = issuer + path;
+        ResponseEntity<String> responseEntity = restTemplate.exchange
+                (url, HttpMethod.DELETE, new HttpEntity<>(createHeaders(user, password)), String.class);
+        if(responseEntity.getBody() != null) {
+            return new JsonParser().parse(responseEntity.getBody());
+        } else {
+            return null;
+        }
+    }
+
+
+    private String createParams(Map<String, String> params) {
+        StringBuilder ret = new StringBuilder("?");
+        int count = 0;
+        for (Map.Entry<String, String> param : params.entrySet()) {
+            ret.append(param.getKey()).append("=").append(param.getValue());
+            count++;
+            if (count != params.entrySet().size()) {
+                ret.append("&");
+            }
+        }
+        return ret.toString();
+    }
+
+    private HttpHeaders createHeaders(String username, String password) {
+        return new HttpHeaders() {{
+            String auth = username + ":" + password;
+            byte[] encodedAuth = Base64.encodeBase64(
+                    auth.getBytes(Charset.forName("US-ASCII")));
+            String authHeader = "Basic " + new String(encodedAuth);
+            set("Authorization", authHeader);
+        }};
+    }
+}
diff --git a/src/main/java/eu/dnetlib/repo/manager/utils/JsonUtils.java b/src/main/java/eu/dnetlib/repo/manager/utils/JsonUtils.java
new file mode 100644
index 0000000..381e0dc
--- /dev/null
+++ b/src/main/java/eu/dnetlib/repo/manager/utils/JsonUtils.java
@@ -0,0 +1,86 @@
+package eu.dnetlib.repo.manager.utils;
+
+import com.google.gson.JsonArray;
+import com.google.gson.JsonElement;
+import com.google.gson.JsonObject;
+import eu.dnetlib.repo.manager.domain.dto.Role;
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.stereotype.Component;
+
+@Component
+public class JsonUtils {
+
+    @Value("1.0")
+    private String version;
+
+    @Value("2")
+    private String coid;
+
+    public JsonObject coPersonRoles(Integer coPersonId, Integer couId, String status) {
+        JsonObject role = new JsonObject();
+        JsonArray coPersonRoles = new JsonArray();
+        JsonObject coPersonRole = new JsonObject();
+        JsonObject person = new JsonObject();
+        person.addProperty("Type", "CO");
+        person.addProperty("Id", coPersonId.toString());
+        coPersonRole.addProperty("Version", version);
+        coPersonRole.add("Person", person);
+        coPersonRole.addProperty("CouId", couId.toString());
+        coPersonRole.addProperty("Affiliation", "member");
+        coPersonRole.addProperty("Title", "");
+        coPersonRole.addProperty("O", "Openaire");
+        coPersonRole.addProperty("Status", status);
+        coPersonRole.addProperty("ValidFrom", "");
+        coPersonRole.addProperty("ValidThrough", "");
+        coPersonRoles.add(coPersonRole);
+        role.addProperty("RequestType", "CoPersonRoles");
+        role.addProperty("Version", version);
+        role.add("CoPersonRoles", coPersonRoles);
+        return role;
+    }
+
+    public JsonObject createNewCou(Role role) {
+        JsonObject cou = new JsonObject();
+        JsonArray cous = new JsonArray();
+        JsonObject newCou = new JsonObject();
+        newCou.addProperty("Version", version);
+        newCou.addProperty("CoId", coid);
+        newCou.addProperty("Name", role.getName());
+        newCou.addProperty("Description", role.getDescription());
+        cous.add(newCou);
+        cou.addProperty("RequestType", "Cous");
+        cou.addProperty("Version", version);
+        cou.add("Cous", cous);
+        return cou;
+    }
+
+    public JsonObject createResponse(JsonElement response) {
+        JsonObject json = new JsonObject();
+        json.add("response", response);
+        return json;
+    }
+
+    public JsonObject createResponse(String response) {
+        JsonObject json = new JsonObject();
+        json.addProperty("response", response);
+        return json;
+    }
+
+    public JsonObject createResponse(Number response) {
+        JsonObject json = new JsonObject();
+        json.addProperty("response", response);
+        return json;
+    }
+
+    public JsonObject createResponse(Boolean response) {
+        JsonObject json = new JsonObject();
+        json.addProperty("response", response);
+        return json;
+    }
+
+    public JsonObject createResponse(Character response) {
+        JsonObject json = new JsonObject();
+        json.addProperty("response", response);
+        return json;
+    }
+}