DirectChat

Disclaimer: This app is not affiliated with nor endorsed by WhatsApp Inc.
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It is rather inconvenient to add someone to your contacts, only to send them a single WhatsApp text. Nak Wasap allows you to send WhatsApp messages directly to the phone number, without saving it to your contacts.
This app uses WhatsApp 'click to chat' feature (https://faq.whatsapp.com/en/android/26000030/) to open a chat with any number (a chat between you and that number).
No contact is created on the device, you don't need to save it on your contacts list. Just open the app, enter the number, click the button and the chat will open (if the number doesn't exists WhatsApp will notify it).
Create links:
You can create an url link that will open WhatsApp on the specified number. This is a WhatsApp feature, you don't need this app to open the link, only to create it.
You can save the link as a quick shortcut, share it so people can contact you, set a predefined message on a site to 'share it on WhatsApp', etc. Remember, you don't need this app to open the link, it is handled by WhatsApp.
Target User:
1. Direct Sell, Online Marketing, Telemarketing, Event
2. People who do Online Business, Online Shop