use link_to, as button_to doesn't allow for openign links in a new tab

app/views/customers/_actions.html.erb

@@ -1,9 +1,9 @@
-<%= link_to t(:label_appointment), "https://calendar.google.com/calendar/render?action=TEMPLATE&text=#{@customer.name}+-&details=#{ link_to t(:customer_details), "https://#{Setting.host_name}#{customer_path @customer.id}"}%0A#{@customer.primary_phone}&dates=#{Time.now.strftime("%Y%m%d")}T090000/#{Time.now.strftime("%Y%m%d")}T170000", target: :_blank %>
+<%= link_to t(:label_appointment), "https://calendar.google.com/calendar/render?action=TEMPLATE&text=#{@customer.name}+-&details=#{ link_to t(:customer_details), "https://#{Setting.host_name}#{customer_path @customer.id}"}%0A#{@customer.primary_phone}%3Cbr/%3E+&dates=#{Time.now.strftime("%Y%m%d")}T090000/#{Time.now.strftime("%Y%m%d")}T170000", target: :_blank, id: :appointment_link %>
 
 <br/>
 <br/>
 
-<%= button_to t(:label_create_estimate), "https://qbo.intuit.com/app/estimate?nameId=#{@customer.id}", target: :_blank, method: :get %>
+<%= link_to t(:label_create_estimate), "https://qbo.intuit.com/app/estimate?nameId=#{@customer.id}", target: :_blank, method: :get %>
 
 <br/>
 <br/>

app/views/estimates/_list.html.erb

@@ -2,6 +2,7 @@
 
   <% estimates.sort.reverse.each do |estimate| %>
     <div class="row">
+      <%= check_box_tag "estimate_ids[]", estimate.id, false,  onchange: "updateLink()", class: "estimate-checkbox" %>
       <b><%= link_to "##{estimate.doc_number}", estimate_path(estimate), target: :_blank %></b> <%= estimate.txn_date %>
     </div>
   <% end %>

app/views/invoices/_list.html.erb

@@ -12,7 +12,7 @@
 
     <% invoices.sort.reverse.each do |invoice| %>
       <div class="row">
-        <%= check_box_tag "invoice_ids[]", invoice.id, false, class: "invoice-checkbox" if invoices.count > 1 %>
+        <%= check_box_tag "invoice_ids[]", invoice.id, false,  onchange: "updateLink()", class: "invoice-checkbox" if invoices.count > 1 %>
         <b><%= link_to "##{invoice.doc_number}", invoice_path(invoice), target: :_blank %></b> <%= invoice.txn_date %>
       </div>
     <% end %>

assets/javascripts/application.js

@@ -0,0 +1,31 @@
+function updateLink() {
+  const linkElement = document.getElementById("appointment_link");
+  const regex = /((?:<br\/>|%3Cbr\/?%3E))([\s\S]*?)(&dates)/gi;
+  linkElement.href = linkElement.href.replace(regex, `$1${getSelectedDocs()}$3`);
+}
+
+function getSelectedDocs() {
+  const invoices = document.querySelectorAll('.invoice-checkbox');
+  const estimates = document.querySelectorAll('.estimate-checkbox');
+  
+  const invoiceIds = Array.from(invoices)
+      .filter(checkbox => checkbox.checked)
+      .map(checkbox => checkbox.value);
+
+  const estimateIds = Array.from(estimates)
+      .filter(checkbox => checkbox.checked)
+      .map(checkbox => checkbox.value);
+
+  let output = '';
+
+  for (const value of invoiceIds) {
+    output += `%0A<a href="${window.location.origin}/invoices/${value}">Invoice:%20${value}</a>%0A`;
+  }
+
+  for (const value of estimateIds) {
+    output += `%0A<a href="${window.location.origin}/estimates/${value}">Estimate:%20${value}</a>%0A`;
+  }
+  
+  // You can return the array or use it as needed
+  return output;
+}

init.rb

@@ -14,7 +14,7 @@ Redmine::Plugin.register :redmine_qbo do
   name 'Redmine QBO plugin'
   author 'Rick Barrette'
   description 'A pluging for Redmine to connect with QuickBooks Online to create Time Activity Entries for billable hours logged when an Issue is closed'
-  version '2026.2.1'
+  version '2026.2.3
   url 'https://github.com/rickbarrette/redmine_qbo'
   author_url 'https://barrettefabrication.com'
   settings default: {empty: true}, partial: 'qbo/settings'

lib/redmine_qbo/patches/issues_controller_patch.rb

@@ -15,6 +15,7 @@ module RedmineQbo
 
       module Helper
         def watcher_link(issue, user)
+          link = ''
           link = link_to(I18n.t(:label_bill_time), bill_path( issue.id ), method: :get, class: 'icon icon-email-add') if user.admin?
           link << link_to(I18n.t(:label_share), share_path( issue.id ), method: :get, target: :_blank, class: 'icon icon-shared') if user.logged?
           link.html_safe + super