We have 1000+ customers who made shopping in our website and mobile app which is powered my iamretailer.com platform. 

We want to send announcement to all 1000+ customers in Email + Whatsapp + Pushnotification + SMS in single button click, is it possible? 

In iamretailer platform, we already configured SMS Gateway, Whatsapp(Interkrt), Onesignal Push and Email server.  So we want to use the same bridge and send this announcement in easy way.