PHP WhatsApp Integration Expert Needed

I am facing issues with my current WhatsApp Business integration. The signup for WhatsApp Business using the Facebook SDK is successful, but I am unable to obtain the access token. This issue arises during the signup process.

- Key issues:
- Successful signup but failure to get access token
- Issue occurs during the signup process

- Ideal Skills:
- Proficiency in PHP
- Experience with WhatsApp Business API
- Familiarity with Facebook SDK
- Strong problem-solving skills
- Ability to debug and fix integration issues

I need a skilled freelancer who can debug this issue and help me obtain the access token necessary for my integration to work.