feat: Custom fields in pre-chat form (#4135)

Fixes: #2744

app/controllers/api/v1/widget/base_controller.rb

@@ -68,7 +68,7 @@ class Api::V1::Widget::BaseController < ApplicationController
         mergee_contact: @contact
       ).perform
     else
-      @contact.update!(email: email, name: contact_name)
+      @contact.update!(email: email, name: contact_name, phone_number: contact_phone_number)
     end
   end
 
@@ -80,6 +80,10 @@ class Api::V1::Widget::BaseController < ApplicationController
     params[:contact][:name] || contact_email.split('@')[0]
   end
 
+  def contact_phone_number
+    params[:contact][:phone_number]
+  end
+
   def browser_params
     {
       browser_name: browser.name,

app/controllers/api/v1/widget/conversations_controller.rb

@@ -51,6 +51,7 @@ class Api::V1::Widget::ConversationsController < Api::V1::Widget::BaseController
   end
 
   def permitted_params
-    params.permit(:id, :typing_status, :website_token, :email, contact: [:name, :email], message: [:content, :referer_url, :timestamp, :echo_id])
+    params.permit(:id, :typing_status, :website_token, :email, contact: [:name, :email, :phone_number],
+                                                               message: [:content, :referer_url, :timestamp, :echo_id])
   end
 end