WhatsApp FAQ - Im an Android developer, how can I integrate WhatsApp with my app?
▻https://www.whatsapp.com/faq/de/android/28000012
Whatsapp n’a pas d’API mais ...
Share Content On WhatsApp Using Lightning - Developer Relations
▻https://developer.salesforce.com/blogs/developer-relations/2015/07/share-content-on-whatsapp-using-lightning.html
Send WhatsApp messages via PHP using WhatsAPI - Philipp’s Tech Blog
▻https://blog.heckel.xyz/2013/07/07/send-whatsapp-messages-via-php-script-using-whatsapi
Chat-API/README.md at master · mgp25/Chat-API · GitHub
▻https://github.com/mgp25/Chat-API/blob/master/README.md
16 secret WhatsApp features that everyone should know about
▻http://www.telegraph.co.uk/technology/2016/05/16/hidden-whatsapp-features-that-everyone-should-know-about