diff --git a/src/app/home/home.component.ts b/src/app/home/home.component.ts
index 402f1b9..a831b7b 100644
--- a/src/app/home/home.component.ts
+++ b/src/app/home/home.component.ts
@@ -59,8 +59,6 @@ export class HomeComponent {
   resultsSize: number = 6;
   errorMessage: string;
 
-  getRecommendationsForOrcidAPI: string = 'https://darelab.athenarc.gr/api/faircore/user-to-item-recommender/recommend'
-
   constructor (
     private _router: Router,
     private _piwikService:PiwikService,
@@ -208,7 +206,7 @@ export class HomeComponent {
 
   getOrcidRecommendations() {
     let orcid = Identifier.getRawORCID(this.user.orcid);
-    this.subs.push(this.recommendationsService.getRecommendationsForOrcid(this.getRecommendationsForOrcidAPI, orcid).subscribe(data => {
+    this.subs.push(this.recommendationsService.getRecommendationsForOrcid(this.properties.recommendationsForOrcidAPI, orcid).subscribe(data => {
       this.recommendations = data['recommendations'];
     }, error => {
       console.log(error);
diff --git a/src/app/natural-language-search/natural-language-search.component.ts b/src/app/natural-language-search/natural-language-search.component.ts
index e8e635a..cca27f7 100644
--- a/src/app/natural-language-search/natural-language-search.component.ts
+++ b/src/app/natural-language-search/natural-language-search.component.ts
@@ -1,6 +1,8 @@
 import {Component} from "@angular/core";
 import {Subscriber} from "rxjs";
 import {NaturalLanguageSearchService} from "./natural-language-search.service";
+import {EnvProperties} from "../openaireLibrary/utils/properties/env-properties";
+import {properties} from "../../environments/environment";
 
 @Component({
   selector: 'natural-language-search',
@@ -10,6 +12,7 @@ import {NaturalLanguageSearchService} from "./natural-language-search.service";
 
 export class NaturalLanguageSearchComponent {
   private subscriptions = [];
+  properties: EnvProperties = properties;
   showLoading: boolean = false;
   errorMessage: string;
 
@@ -18,8 +21,6 @@ export class NaturalLanguageSearchComponent {
   results;
   indexColumnId: number;
 
-  naturalLanguageSearchAPI: string = "https://darelab.athenarc.gr/nl_search/api/fc4e_get_results/";
-
   constructor(private naturalLanguageSearchService: NaturalLanguageSearchService) {
   }
 
@@ -35,7 +36,7 @@ export class NaturalLanguageSearchComponent {
     this.queryPhrase = this.phrase;
     this.errorMessage = null;
     this.showLoading = true;
-    this.subscriptions.push(this.naturalLanguageSearchService.getResults(this.naturalLanguageSearchAPI, this.queryPhrase).subscribe(data => {
+    this.subscriptions.push(this.naturalLanguageSearchService.getResults(this.properties.naturalLanguageSearchAPI, this.queryPhrase).subscribe(data => {
       if(data && data['columns']) {
         for(let i = 0; i < data['columns'].length - 1; i++) {
           if(data['columns'][i] == 'id') {
diff --git a/src/app/openaireLibrary b/src/app/openaireLibrary
index 2b12959..623debc 160000
--- a/src/app/openaireLibrary
+++ b/src/app/openaireLibrary
@@ -1 +1 @@
-Subproject commit 2b12959a4ec134092f2d3bf58586518d85d031ae
+Subproject commit 623debc84662a0e61f197efe506cf121acc5bd49
diff --git a/src/app/recommendations/category-to-item/category-to-item.component.ts b/src/app/recommendations/category-to-item/category-to-item.component.ts
index aa39c5c..b290092 100644
--- a/src/app/recommendations/category-to-item/category-to-item.component.ts
+++ b/src/app/recommendations/category-to-item/category-to-item.component.ts
@@ -30,9 +30,6 @@ export class CategoryToItemComponent {
   keywordControl: FormControl;
   keyword: string;
 
-  getAvailableCommunitiesAPI: string = 'https://darelab.athenarc.gr/api/faircore/category-based-recommender/available-communities';
-  getRecommendationsForCommunityAPI: string = 'https://darelab.athenarc.gr/api/faircore/category-based-recommender/recommend';
-
   constructor(private communitiesService: CommunitiesService,
               private recommendationsService: RecommendationsService,
               private router: Router,
@@ -48,7 +45,7 @@ export class CategoryToItemComponent {
     this.getCommunities();
     this.subscriptions.push(this.route.params.subscribe(params => {
       if(params && params['community']) {
-        this.subscriptions.push(this.recommendationsService.getRecommendationsForCommunity(this.getRecommendationsForCommunityAPI, params['community']).subscribe(data => {
+        this.subscriptions.push(this.recommendationsService.getRecommendationsForCommunity(this.properties.recommendationsForCommunityAPI, params['community']).subscribe(data => {
           this.recommendations = data;
           this.setActiveCommunity(params['community']);
         }));
@@ -70,7 +67,7 @@ export class CategoryToItemComponent {
 	}
 
   private getCommunities() {
-    this.subscriptions.push(zip(this.recommendationsService.getAvailableCommunities(this.getAvailableCommunitiesAPI), this.communitiesService.getCommunities(this.properties, this.properties.communitiesAPI)).subscribe(data => {
+    this.subscriptions.push(zip(this.recommendationsService.getAvailableCommunities(this.properties.availableCommunitiesAPI), this.communitiesService.getCommunities(this.properties, this.properties.communitiesAPI)).subscribe(data => {
       let availableCommunities: any = data[0];
       this.communities = availableCommunities.map(id => {
         const obj = data[1].find(o => o.communityId === id);
diff --git a/src/environments/environment.beta.ts b/src/environments/environment.beta.ts
index 65ffc42..8f4cd17 100644
--- a/src/environments/environment.beta.ts
+++ b/src/environments/environment.beta.ts
@@ -25,7 +25,14 @@ let props: EnvProperties = {
   searchLinkToServices: "/search/find/services",
   searchLinkToAdvancedServices: "/search/advanced/services",
   reCaptchaSiteKey: null,
-  footerGrantText : ""
+  footerGrantText : "",
+
+  naturalLanguageSearchAPI: "https://darelab.athenarc.gr/nl_search/api/fc4e_get_results/",
+  availableCommunitiesAPI: 'https://darelab.athenarc.gr/api/faircore/category-based-recommender/available-communities',
+  recommendationsForCommunityAPI: 'https://darelab.athenarc.gr/api/faircore/category-based-recommender/recommend',
+  recommendationsForOrcidAPI: 'https://darelab.athenarc.gr/api/faircore/user-to-item-recommender/recommend',
+  recommendationsForPublicationAPI: 'https://darelab.athenarc.gr/api/faircore/item-to-item-recommender/recommend/',
+  feedbackForRecommendationAPI: 'https://darelab.athenarc.gr/api/faircore/category-based-recommender/update/'
 };
 
 export let properties: EnvProperties = {
diff --git a/src/environments/environment.prod.ts b/src/environments/environment.prod.ts
index afc3dc2..49b4bb9 100644
--- a/src/environments/environment.prod.ts
+++ b/src/environments/environment.prod.ts
@@ -25,7 +25,14 @@ let props: EnvProperties = {
   searchLinkToServices: "/search/find/services",
   searchLinkToAdvancedServices: "/search/advanced/services",
   reCaptchaSiteKey: null,
-  footerGrantText : ""
+  footerGrantText : "",
+
+  naturalLanguageSearchAPI: "https://darelab.athenarc.gr/nl_search/api/fc4e_get_results/",
+  availableCommunitiesAPI: 'https://darelab.athenarc.gr/api/faircore/category-based-recommender/available-communities',
+  recommendationsForCommunityAPI: 'https://darelab.athenarc.gr/api/faircore/category-based-recommender/recommend',
+  recommendationsForOrcidAPI: 'https://darelab.athenarc.gr/api/faircore/user-to-item-recommender/recommend',
+  recommendationsForPublicationAPI: 'https://darelab.athenarc.gr/api/faircore/item-to-item-recommender/recommend/',
+  feedbackForRecommendationAPI: 'https://darelab.athenarc.gr/api/faircore/category-based-recommender/update/'
 };
 
 export let properties: EnvProperties = {
diff --git a/src/environments/environment.ts b/src/environments/environment.ts
index a55fd01..06dd088 100644
--- a/src/environments/environment.ts
+++ b/src/environments/environment.ts
@@ -25,7 +25,14 @@ let props: EnvProperties = {
   searchLinkToServices: "/search/find/services",
   searchLinkToAdvancedServices: "/search/advanced/services",
   reCaptchaSiteKey: null,
-  footerGrantText : "This OpenAIRE gateway is part of a project that has received funding from the European Union's Horizon 2020 research and innovation programme under grant agreements No. 777541 and 101017452"
+  footerGrantText : "This OpenAIRE gateway is part of a project that has received funding from the European Union's Horizon 2020 research and innovation programme under grant agreements No. 777541 and 101017452",
+
+  naturalLanguageSearchAPI: "https://darelab.athenarc.gr/nl_search/api/fc4e_get_results/",
+  availableCommunitiesAPI: 'https://darelab.athenarc.gr/api/faircore/category-based-recommender/available-communities',
+  recommendationsForCommunityAPI: 'https://darelab.athenarc.gr/api/faircore/category-based-recommender/recommend',
+  recommendationsForOrcidAPI: 'https://darelab.athenarc.gr/api/faircore/user-to-item-recommender/recommend',
+  recommendationsForPublicationAPI: 'https://darelab.athenarc.gr/api/faircore/item-to-item-recommender/recommend/',
+  feedbackForRecommendationAPI: 'https://darelab.athenarc.gr/api/faircore/category-based-recommender/update/'
 };
 
 export let properties: EnvProperties = {