Facebook login / team authorization

Hello! Not sure how to classify this - if I need an app or VPN.......but here is my situation. DO NOT JUST COPY AND PASTE YOUR RESPONSE.... Please let me know what your suggested solutions are and how you can help implement.

I do various business management tasks which requires me to login to my customers Facebook account (I need to do communications and posts on their personal page - not the FB Business manager). My team and I are located across North America and my clients are all over the world. I need a way so that my team and I are authorized to login to their account in a way doesn't look like this activity is spamming or hacking. I want to be clear - this is NOT a hacking job - I have their authorization and credentials. I need something that will allow myself and my team to access their page.

I honestly don't know what I NEED to get this problem solved so any ideas, solutions, etc are greatly appreciated. The budget is arbitrary because I really don't know how to solve the problem but am open to discussions.

MUST ANSWER THESE QUESTIONS

1 - what do you feel the proposed solution is

2 - how can you help to develop/implement that idea

3 - what is your budget and timeline

Skills: Software Architecture, Mobile App Development, OpenVPN, Web Security

Project ID: #26620828