How to not get Banned?

WhatsApp knows that it's uncommon for someone to send so many messages or bulk messages to people they've never talked to each other before so it is considered as spam/marketing junk pretty fast. There is some tips before sending message to WhatsApp.

Dos and Don'ts:

1. Important: Do NOT send messages which get you a report. As long as you don't getting reports from users who you sent message to, your account will be mostly fine.
2. Have a real content, a survey that the person agreed with is different than a marketing message on a saturday night.
3. Send messages written in different ways, you could make a script that places spacebars randomly on your string AND include the person's (first) name
4. Never use fixed times, always go for sending the first message, wait a random time between 30 ~60 seconds and then send the second message
5. Always try to group contacts by their area code, WhatsApp expects a regular person to talk mostly with contacts that are within the same area of your phone number.
6. Have a profile picture, this is not related to WhatsApp Bots Catcher® but sending a new message for someone not having a picture/name/status will elevate your chances of being manually tagged as spam.
7. Send "seen" confirmation to messages or disable it on WhatsApp
8. Avoid sending links that were previously marked as spam on WhatsApp or non-HTTPS. A URL shortener is a good idea
9. IMPORTANT: It's really bad if you send messages 24/7 without giving it some time to wait. Random delays between messages are not enough, send a resonable amount of messages keeping in mind your conversions rate, example: for one hour send a maximum of 4 messages per contact that have replied to your message, stop sending messages for one hours, then start again. Again, don't send messages without stopping for a while between every "package"
10. Send only one short message when starting a conversation, one should not send long texts or multiple messages without the user consenting
11. Avoid prefixes for messages

Have in mind:

1. For everyone you send a message that doesn't have your number on their contact list asked if it's spam, being tagged as spam a few times (5 - 10) will definitely get you banned
2. WhatsApp records every movement you do, you can even check the logs when sending simple support email, it contains all kinds of information, this said: act as human as possible
3. Try to engage in conversations, as long as you send a message and the person doesn't automatically blocks you it'll be quite okay. People constantly talking to you and adding you to their contact list will make your number stronger against a ban
4. Think about that like a points system, you start with zero points (negative if your device were previously blacklisted), if you reach below zero you are out, if you engage in conversations you get a point, if you are tagged as spam you lose some points, if you are blocked you may lose more points
5. Finally, If your content is clearly spam, it doesn't matter if you are using a broadcast list, group or direct contact, you will still be banned

As API provider we say all that's left to do right now is agreeing with WhatsApp's policy, not sending spam messages and always wait for the other person to contact you first. You could make it by sending an SMS to the person with a link to start a chat on WhatsApp with you.