Update new services with initialization based on existing data.

app/models/project_services/custom_issue_tracker_service.rb

@@ -19,7 +19,7 @@ class CustomIssueTrackerService < IssueTrackerService
   end
 
   def to_param
-    title.parameterize
+    'custom_issue_tracker'
   end
 
   def fields

app/models/project_services/jira_service.rb

@@ -37,7 +37,7 @@ class JiraService < IssueTrackerService
       if enabled_in_gitlab_config
         self.properties = {
           title: issues_tracker['title'],
-          project_url: issues_tracker['project_url'],
+          project_url: set_project_url,
           issues_url: issues_tracker['issues_url'],
           new_issue_url: issues_tracker['new_issue_url']
         }
@@ -56,4 +56,14 @@ class JiraService < IssueTrackerService
   def issues_tracker
     Gitlab.config.issues_tracker['jira']
   end
+
+  def set_project_url
+    id = self.project.issues_tracker_id
+
+    if id
+      issues_tracker['project_url'].gsub(":issues_tracker_id", id)
+    else
+      issues_tracker['project_url']
+    end
+  end
 end

app/models/project_services/redmine_service.rb

@@ -27,7 +27,7 @@ class RedmineService < IssueTrackerService
       if enabled_in_gitlab_config
         self.properties = {
           title: issues_tracker['title'],
-          project_url: issues_tracker['project_url'],
+          project_url: set_project_url,
           issues_url: issues_tracker['issues_url'],
           new_issue_url: issues_tracker['new_issue_url']
         }
@@ -46,4 +46,13 @@ class RedmineService < IssueTrackerService
   def issues_tracker
     Gitlab.config.issues_tracker['redmine']
   end
+
+  def set_project_url
+    id = self.project.issue_tracker_id
+    if id
+      issues_tracker['project_url'].gsub(":issue_tracker_id", id)
+    else
+      issues_tracker['project_url']
+    end
+  end
 end