A lot of people have started using WhatsApp API for sending messages & running bulk marketing campaigns now. But, with gazillions of services, tools, software, and web-based solutions available today. It can be a little tricky & confusing to decide which one is the best Whatsapp Marketing & WhatsApp Business API, solution provider. And also, you have to keep a check on the pricing which will be cost effective for your marketing campaigns.
There are many WhatsApp Marketing API services, which charge you on a monthly basis but if you calculate a long term cost that will be incurred to send message to Whatsapp API then you will realize the cost will drastically increase if you have a lot more subscribers coming each month on these monthly costs.
Some brands charge as much as 700$/month like messenger people which is way too expensive and hence, goes out of reach for the majority of the brands, companies, and vendors who wish to further resell this kind of services also.
There are other one time and yet, highly cheaper solutions like WA Panel, which is a complete web hosted Whatsapp marketing script which provides you with their WhatsApp marketing API support in their enterprise edition version.
Then, there are other self-hosted solutions for running Bulk WhatsApp Marketing Campaigns like WAPP Bulk Panel, WA Bulk Panel, WA Bulk Sender, WhatsApp Software, and WhatsApp Channels which can help you automate running scalable WhatsApp marketing campaigns using desktop & web-based WhatsApp Marketing Tools.
Out of multiple options available right now, I think WA Panel should be the best solution available to anyone who will like to pay a one time cost to run unlimited Bulk WhatsApp API Campaigns and be able to send bulk WhatsApp Messages via API
And the best part is that you can also select to resell WhatsApp Marketing API to other client using their WhatsApp Reseller Panel known as Reseller Edition.
For those who are looking to customize & resell the source code directly and need to enhance this same product into a more highly integrated system with other functionalities. The best-suited version is the Source Code Edition
There are very few products available like in the marketplace now, then back in 2016,2017, and 2018. And with 2019, there are so many solutions which fail to operate but WA Panel is taking its lead with so many integrated functionalities into one Whatsapp Marketing Solution
P.S. WA Panel only works with few clients each month and they have an invite system to take new clients. Best medium to get their solution is through Telegram: https://t.me/WhatsAppPanel