diff --git a/registry-integration-tests/src/test/java/org/gbif/registry/ws/it/collections/resource/CollectionResourceIT.java b/registry-integration-tests/src/test/java/org/gbif/registry/ws/it/collections/resource/CollectionResourceIT.java
index 2e2eb1600e..d638d2b697 100644
--- a/registry-integration-tests/src/test/java/org/gbif/registry/ws/it/collections/resource/CollectionResourceIT.java
+++ b/registry-integration-tests/src/test/java/org/gbif/registry/ws/it/collections/resource/CollectionResourceIT.java
@@ -14,6 +14,8 @@
 import org.gbif.registry.search.test.EsManageServer;
 import org.gbif.registry.service.collections.duplicates.CollectionDuplicatesService;
 import org.gbif.registry.service.collections.duplicates.DuplicatesService;
+import org.gbif.registry.service.collections.merge.CollectionMergeService;
+import org.gbif.registry.service.collections.merge.MergeService;
 import org.gbif.registry.ws.client.collections.CollectionClient;
 import org.gbif.ws.client.filter.SimplePrincipalProvider;
 
@@ -38,6 +40,8 @@ public class CollectionResourceIT extends PrimaryCollectionEntityResourceIT<Coll
 
   @MockBean private CollectionDuplicatesService collectionDuplicatesService;
 
+  @MockBean private CollectionMergeService collectionMergeService;
+
   @Autowired
   public CollectionResourceIT(
       SimplePrincipalProvider simplePrincipalProvider,
@@ -101,7 +105,7 @@ public void listDeletedTest() {
     assertEquals(views.size(), result.getResults().size());
   }
 
-  // TODO: merge, suggestions
+  // TODO: suggestions
 
   @Override
   protected PrimaryCollectionEntityService<Collection> getMockPrimaryEntityService() {
@@ -113,6 +117,11 @@ protected DuplicatesService getMockDuplicatesService() {
     return collectionDuplicatesService;
   }
 
+  @Override
+  protected MergeService<Collection> getMockMergeService() {
+    return collectionMergeService;
+  }
+
   protected CollectionClient getClient() {
     return (CollectionClient) baseClient;
   }
diff --git a/registry-integration-tests/src/test/java/org/gbif/registry/ws/it/collections/resource/InstitutionResourceIT.java b/registry-integration-tests/src/test/java/org/gbif/registry/ws/it/collections/resource/InstitutionResourceIT.java
index a0275caf47..93fd91bfed 100644
--- a/registry-integration-tests/src/test/java/org/gbif/registry/ws/it/collections/resource/InstitutionResourceIT.java
+++ b/registry-integration-tests/src/test/java/org/gbif/registry/ws/it/collections/resource/InstitutionResourceIT.java
@@ -1,6 +1,7 @@
 package org.gbif.registry.ws.it.collections.resource;
 
 import org.gbif.api.model.collections.Institution;
+import org.gbif.api.model.collections.merge.ConvertToCollectionParams;
 import org.gbif.api.model.collections.request.InstitutionSearchRequest;
 import org.gbif.api.model.common.paging.Pageable;
 import org.gbif.api.model.common.paging.PagingRequest;
@@ -13,6 +14,8 @@
 import org.gbif.registry.search.test.EsManageServer;
 import org.gbif.registry.service.collections.duplicates.DuplicatesService;
 import org.gbif.registry.service.collections.duplicates.InstitutionDuplicatesService;
+import org.gbif.registry.service.collections.merge.InstitutionMergeService;
+import org.gbif.registry.service.collections.merge.MergeService;
 import org.gbif.registry.ws.client.collections.InstitutionClient;
 import org.gbif.ws.client.filter.SimplePrincipalProvider;
 
@@ -36,6 +39,8 @@ public class InstitutionResourceIT extends PrimaryCollectionEntityResourceIT<Ins
 
   @MockBean private InstitutionDuplicatesService institutionDuplicatesService;
 
+  @MockBean private InstitutionMergeService institutionMergeService;
+
   @Autowired
   public InstitutionResourceIT(
       SimplePrincipalProvider simplePrincipalProvider,
@@ -102,7 +107,21 @@ public void listDeletedTest() {
     assertEquals(institutions.size(), result.getResults().size());
   }
 
-  // TODO: merge, suggestions
+  @Test
+  public void convertToCollectionTest() {
+    UUID convertedCollectionKey = UUID.randomUUID();
+    when(institutionMergeService.convertToCollection(any(UUID.class), any(UUID.class), anyString()))
+        .thenReturn(convertedCollectionKey);
+
+    ConvertToCollectionParams params = new ConvertToCollectionParams();
+    params.setInstitutionForNewCollectionKey(UUID.randomUUID());
+    params.setNameForNewInstitution("name");
+
+    assertEquals(
+        convertedCollectionKey, getClient().convertToCollection(UUID.randomUUID(), params));
+  }
+
+  // TODO: suggestions
 
   @Override
   protected PrimaryCollectionEntityService<Institution> getMockPrimaryEntityService() {
@@ -114,6 +133,11 @@ protected DuplicatesService getMockDuplicatesService() {
     return institutionDuplicatesService;
   }
 
+  @Override
+  protected MergeService<Institution> getMockMergeService() {
+    return institutionMergeService;
+  }
+
   protected InstitutionClient getClient() {
     return (InstitutionClient) baseClient;
   }
diff --git a/registry-integration-tests/src/test/java/org/gbif/registry/ws/it/collections/resource/PrimaryCollectionEntityResourceIT.java b/registry-integration-tests/src/test/java/org/gbif/registry/ws/it/collections/resource/PrimaryCollectionEntityResourceIT.java
index 7b3c86f52f..fe2050b8be 100644
--- a/registry-integration-tests/src/test/java/org/gbif/registry/ws/it/collections/resource/PrimaryCollectionEntityResourceIT.java
+++ b/registry-integration-tests/src/test/java/org/gbif/registry/ws/it/collections/resource/PrimaryCollectionEntityResourceIT.java
@@ -24,6 +24,7 @@
 import org.gbif.api.model.collections.duplicates.Duplicate;
 import org.gbif.api.model.collections.duplicates.DuplicatesRequest;
 import org.gbif.api.model.collections.duplicates.DuplicatesResult;
+import org.gbif.api.model.collections.merge.MergeParams;
 import org.gbif.api.model.registry.Commentable;
 import org.gbif.api.model.registry.Identifiable;
 import org.gbif.api.model.registry.LenientEquals;
@@ -34,6 +35,7 @@
 import org.gbif.registry.persistence.mapper.collections.params.DuplicatesSearchParams;
 import org.gbif.registry.search.test.EsManageServer;
 import org.gbif.registry.service.collections.duplicates.DuplicatesService;
+import org.gbif.registry.service.collections.merge.MergeService;
 import org.gbif.registry.ws.client.collections.BaseCollectionEntityClient;
 import org.gbif.registry.ws.client.collections.PrimaryCollectionEntityClient;
 import org.gbif.ws.client.filter.SimplePrincipalProvider;
@@ -185,6 +187,16 @@ public void possibleDuplicatesTest() {
     assertEquals(result.getDuplicates().size(), clientResult.getDuplicates().size());
   }
 
+  @Test
+  public void mergeTest() {
+    doNothing().when(getMockMergeService()).merge(any(UUID.class), any(UUID.class));
+
+    MergeParams mergeParams = new MergeParams();
+    mergeParams.setReplacementEntityKey(UUID.randomUUID());
+    assertDoesNotThrow(
+        () -> getPrimaryCollectionEntityClient().merge(UUID.randomUUID(), mergeParams));
+  }
+
   protected PrimaryCollectionEntityClient<T> getPrimaryCollectionEntityClient() {
     return (PrimaryCollectionEntityClient<T>) baseClient;
   }
@@ -192,4 +204,6 @@ protected PrimaryCollectionEntityClient<T> getPrimaryCollectionEntityClient() {
   protected abstract PrimaryCollectionEntityService<T> getMockPrimaryEntityService();
 
   protected abstract DuplicatesService getMockDuplicatesService();
+
+  protected abstract MergeService<T> getMockMergeService();
 }
diff --git a/registry-ws-client/src/main/java/org/gbif/registry/ws/client/collections/InstitutionClient.java b/registry-ws-client/src/main/java/org/gbif/registry/ws/client/collections/InstitutionClient.java
index 80cc4bf55d..751521d676 100644
--- a/registry-ws-client/src/main/java/org/gbif/registry/ws/client/collections/InstitutionClient.java
+++ b/registry-ws-client/src/main/java/org/gbif/registry/ws/client/collections/InstitutionClient.java
@@ -16,15 +16,19 @@
 package org.gbif.registry.ws.client.collections;
 
 import org.gbif.api.model.collections.Institution;
+import org.gbif.api.model.collections.merge.ConvertToCollectionParams;
 import org.gbif.api.model.collections.request.InstitutionSearchRequest;
 import org.gbif.api.model.common.paging.Pageable;
 import org.gbif.api.model.common.paging.PagingResponse;
 import org.gbif.api.model.registry.search.collections.KeyCodeNameResult;
 
 import java.util.List;
+import java.util.UUID;
 
 import org.springframework.cloud.openfeign.SpringQueryMap;
 import org.springframework.http.MediaType;
+import org.springframework.web.bind.annotation.PathVariable;
+import org.springframework.web.bind.annotation.RequestBody;
 import org.springframework.web.bind.annotation.RequestMapping;
 import org.springframework.web.bind.annotation.RequestMethod;
 import org.springframework.web.bind.annotation.RequestParam;
@@ -50,4 +54,13 @@ public interface InstitutionClient extends PrimaryCollectionEntityClient<Institu
       produces = MediaType.APPLICATION_JSON_VALUE)
   @ResponseBody
   List<KeyCodeNameResult> suggest(@RequestParam(value = "q", required = false) String q);
+
+  @RequestMapping(
+      method = RequestMethod.POST,
+      value = "{key}/convertToCollection",
+      produces = MediaType.APPLICATION_JSON_VALUE,
+      consumes = MediaType.APPLICATION_JSON_VALUE)
+  @ResponseBody
+  UUID convertToCollection(
+      @PathVariable("key") UUID entityKey, @RequestBody ConvertToCollectionParams params);
 }
diff --git a/registry-ws-client/src/main/java/org/gbif/registry/ws/client/collections/PrimaryCollectionEntityClient.java b/registry-ws-client/src/main/java/org/gbif/registry/ws/client/collections/PrimaryCollectionEntityClient.java
index b74ad06a63..49b7709849 100644
--- a/registry-ws-client/src/main/java/org/gbif/registry/ws/client/collections/PrimaryCollectionEntityClient.java
+++ b/registry-ws-client/src/main/java/org/gbif/registry/ws/client/collections/PrimaryCollectionEntityClient.java
@@ -21,6 +21,7 @@
 import org.gbif.api.model.collections.Person;
 import org.gbif.api.model.collections.duplicates.DuplicatesRequest;
 import org.gbif.api.model.collections.duplicates.DuplicatesResult;
+import org.gbif.api.model.collections.merge.MergeParams;
 import org.gbif.api.model.registry.Identifiable;
 import org.gbif.api.model.registry.MachineTaggable;
 import org.gbif.api.model.registry.Taggable;
@@ -83,4 +84,10 @@ void deleteOccurrenceMapping(
       produces = MediaType.APPLICATION_JSON_VALUE)
   @ResponseBody
   DuplicatesResult findPossibleDuplicates(@SpringQueryMap DuplicatesRequest request);
+
+  @RequestMapping(
+      method = RequestMethod.POST,
+      value = "{key}/merge",
+      consumes = MediaType.APPLICATION_JSON_VALUE)
+  void merge(@PathVariable("key") UUID entityKey, @RequestBody MergeParams params);
 }