Mobile website “WhatsApp” button to send message to a specific number

Question

A mobile website can be customized to allow users to share a pre-filled message in WhatsApp to a manually chosen contact. As given here it is done using Custom URL Scheme. A

Answer 1

On android, you can try

href="intent://send/[countrycode_without_plus][number]#Intent;scheme=smsto;package=com.whatsapp;action=android.intent.action.SENDTO;end

replace [countrycode_without_plus][number] with the number,