WhatsApp API Automation with n8n

I'm looking for an expert to set up a WhatsApp Business API flow endpoint integrated with n8n.
Hi I am trying to send what app flow with whats app cloud APi message template.
https://business.facebook.com/latest/whatsapp_manager/flows?
I understand we will need to sign a public key, need help with the same.
we are using n8n automation to send our message .
You need to upload and sign a public key to a phone number before you can send or publish a flow.
I have n8n workflow ready to send messages just need help to
to sign a public key,endpoint need help with the same

Key Requirements:
- Setup WhatsApp Business API flow endpoint
- Integrate with n8n for automation
- Focus on customer support automation
- Automate answering common queries

Ideal Skills and Experience:
- Experience with WhatsApp Business API
- Proficiency in n8n
- Strong background in automation tools
- Familiarity with customer support workflows

Please provide a portfolio or examples of similar work done.