diff --git a/app/controllers/api/submissions_controller.rb b/app/controllers/api/submissions_controller.rb
index ce8334fc..7080c722 100644
--- a/app/controllers/api/submissions_controller.rb
+++ b/app/controllers/api/submissions_controller.rb
@@ -2,6 +2,9 @@
 
 module Api
   class SubmissionsController < ApiBaseController
+    UnknownFieldName = Class.new(StandardError)
+    UnknownSubmitterName = Class.new(StandardError)
+
     def create
       template = current_account.templates.find(params[:template_id])
 
@@ -13,28 +16,65 @@ module Api
                                          send_email: params[:send_email] != 'false',
                                          emails: params[:emails] || params[:email])
         else
+          submissions_attrs = normalize_submissions_params!(submissions_params[:submission], template)
+
           Submissions.create_from_submitters(template:,
                                              user: current_user,
                                              source: :api,
                                              send_email: params[:send_email] != 'false',
-                                             submissions_attrs: submissions_params[:submission])
+                                             submissions_attrs:)
         end
 
       submitters = submissions.flat_map(&:submitters)
 
-      if params[:send_email] != 'false'
-        submitters.each do |submitter|
-          SubmitterMailer.invitation_email(submitter, message: params[:message]).deliver_later!
-        end
-      end
+      send_invitation_emails(submitters) if params[:send_email] != 'false'
 
       render json: submitters
+    rescue UnknownFieldName, UnknownSubmitterName => e
+      render json: { error: e.message }, status: :unprocessable_entity
     end
 
     private
 
+    def send_invitation_emails(submitters)
+      submitters.each do |submitter|
+        SubmitterMailer.invitation_email(submitter, message: params[:message]).deliver_later!
+      end
+    end
+
     def submissions_params
-      params.permit(submission: [{ submitters: [%i[uuid name email]] }])
+      params.permit(submission: [{ submitters: [[:uuid, :name, :email, { values: {} }]] }])
+    end
+
+    def normalize_submissions_params!(submissions_params, template)
+      submissions_params.each do |submission|
+        submission[:submitters].each_with_index do |submitter, index|
+          next if submitter[:values].blank?
+
+          submitter[:values] =
+            normalize_submitter_values(template,
+                                       submitter[:values], submitter[:name] || template.submitters[index]['name'])
+        end
+      end
+
+      submissions_params
+    end
+
+    def normalize_submitter_values(template, values, submitter_name)
+      submitter =
+        template.submitters.find { |e| e['name'] == submitter_name } ||
+        raise(UnknownSubmitterName, "Unknown submitter: #{submitter_name}")
+
+      fields = template.fields.select { |e| e['submitter_uuid'] == submitter['uuid'] }
+
+      fields_uuid_index = fields.index_by { |e| e['uuid'] }
+      fields_name_index = fields.index_by { |e| e['name'] }
+
+      values.transform_keys do |key|
+        next key if fields_uuid_index[key].present?
+
+        fields_name_index[key]&.dig('uuid') || raise(UnknownFieldName, "Unknown field: #{key}")
+      end
     end
   end
 end
diff --git a/app/controllers/api/templates_controller.rb b/app/controllers/api/templates_controller.rb
index af7ae691..0412a14a 100644
--- a/app/controllers/api/templates_controller.rb
+++ b/app/controllers/api/templates_controller.rb
@@ -2,13 +2,17 @@
 
 module Api
   class TemplatesController < ApiBaseController
+    before_action :load_template, only: %i[show update]
+
     def index
       render json: current_account.templates
     end
 
-    def update
-      @template = current_account.templates.find(params[:id])
+    def show
+      render json: @template.as_json(include: { author: { only: %i[id email first_name last_name] } })
+    end
 
+    def update
       @template.update!(template_params)
 
       render :ok
@@ -23,5 +27,9 @@ module Api
                                        fields: [[:uuid, :submitter_uuid, :name, :type, :required,
                                                  { options: [], areas: [%i[x y w h cell_w attachment_uuid page]] }]])
     end
+
+    def load_template
+      @template = current_account.templates.find(params[:id])
+    end
   end
 end
diff --git a/app/views/api_settings/index.html.erb b/app/views/api_settings/index.html.erb
index 459b2eb2..a07b6962 100644
--- a/app/views/api_settings/index.html.erb
+++ b/app/views/api_settings/index.html.erb
@@ -42,7 +42,7 @@
         <input type="checkbox">
         <div class="collapse-title text-xl font-medium">
           <div>
-            Request signature, multiple submitters
+            Request signature, multiple submitters with default values
           </div>
           <div class="mt-1">
             <div class="badge badge-warning badge-lg">POST</div>
@@ -58,7 +58,13 @@
          "submission": [
            {
              "submitters": [
-               { "name": "<%= current_account.templates.last ? current_account.templates.last.submitters.first['name'] : 'First Submitter' %>", "email": "<%= current_user.email.sub('@', '+test@') %>" },
+               {
+                 "name": "<%= current_account.templates.last ? current_account.templates.last.submitters.first['name'] : 'First Submitter' %>",
+                 "email": "<%= current_user.email.sub('@', '+test@') %>",
+                 "values": {
+                   "Form Text Field Name": "Default Value"
+                 }
+               },
                { "name": "Second Submitter", "email": "<%= current_user.email.sub('@', '+test2@') %>" }
              ]
            }
@@ -71,6 +77,28 @@
           </div>
         </div>
       </div>
+      <div class="collapse collapse-plus bg-base-200 px-1">
+        <input type="checkbox">
+        <div class="collapse-title text-xl font-medium">
+          <div>
+            Template details
+          </div>
+          <div class="mt-1">
+            <div class="badge badge-info badge-lg">GET</div>
+            <div class="badge badge-primary badge-lg"><%= api_template_path(':id') %></div>
+          </div>
+        </div>
+        <div class="collapse-content" style="display: inherit">
+          <div class="mockup-code overflow-hidden">
+            <% text = capture do %>curl '<%= api_template_url(current_account.templates.last) %>' \
+       --header 'X-Auth-Token: <%= current_user.access_token.token %>'<% end.to_str %>
+            <span class="top-0 right-0 absolute">
+              <%= render 'shared/clipboard_copy', icon: 'copy', text:, class: 'btn btn-ghost text-white', icon_class: 'w-6 h-6 text-white', copy_title: 'Copy', copied_title: 'Copied' %>
+            </span>
+            <pre data-prefix="$"><code class="overflow-hidden w-full"><%= text %></code></pre>
+          </div>
+        </div>
+      </div>
     </div>
   </div>
 </div>
diff --git a/config/routes.rb b/config/routes.rb
index f05a2e39..5f3e55a9 100644
--- a/config/routes.rb
+++ b/config/routes.rb
@@ -30,7 +30,7 @@ Rails.application.routes.draw do
   namespace :api, defaults: { format: :json } do
     resources :attachments, only: %i[create]
     resources :submissions, only: %i[create]
-    resources :templates, only: %i[update index] do
+    resources :templates, only: %i[update show index] do
       resources :submissions, only: %i[create]
       resources :documents, only: %i[create destroy], controller: 'templates_documents'
     end
diff --git a/lib/submissions.rb b/lib/submissions.rb
index 69530e6a..fadea04e 100644
--- a/lib/submissions.rb
+++ b/lib/submissions.rb
@@ -38,6 +38,7 @@ module Submissions
 
         submission.submitters.new(email: submitter_attrs[:email],
                                   sent_at: send_email ? Time.current : nil,
+                                  values: submitter_attrs[:values] || {},
                                   uuid:)
       end