Finishing Whatsapp Business API Setup

I came from a similar state in this question.

My objective is to reply to interested customers via whatsapp messages. I'll use a very special setup, so I'll be using the API.

Reasons:

• With not to pay anyone other than container hosts
• Solution with custom API
• Customer doesn't like any extra costs

Just like user noboundaries, I see the numbers, but I cant get the certificate User Navjot Singh has explained I need to create a "business api account"

I tried just that, put out all my contacts and stuff, in this site. They did respond yes, but only with pointless instructions, since I wish not to contract any messaging providers. I had taken a look at it, but they charge a very expensive price beyond the $0.005 whatsapp will charge. Also, the solution I'm creating requires messages to be sent programatically, and the partners don't seem to provide the correct solution.

So, I wish to skip into using the api. I followed the appropriate guides:

• Getting started
• Phone Number

I already got some things done:

• two phone numbers (one of them for testing) with whatsapp business;
• company has been verified, with domain
• have business management account
• local environment with docker

I can access the local environment and I have set an user account and the admin acount. I can log into those via the API, since postman can ignore certificates, but in order to proceed I really feel like I need that certificate.

So to sim up I guess I need help creating the whatsapp business account for my customer. Any advice? Also i'd appreciate any other helpful insight or feedback. I really feel lost and I don't see a place where I can talk to people trying to do the same thing, or doing this is much of a madness after all?

thanks for getting to read until here, and I apologize for my non natural, almost broken English.