THIS VEDIO EXPLAIN 
https://youtu.be/Nd-wRVjk9NE?si=-8BGB4AgI8qfS-Zk

Hi,

We can create permanent whatsapp token by following these step                                    1. Go to Business Settings. 

2. Select the business account your app is associated with. 

3. Below Users, click System Users. 

4. Click Add. 

5. Name the system user, choose Admin as the user role, and click Create System User. 

6. Select the whatsapp_business_messaging permission. 

7. Click Generate New Token.

Hope it helps

Thanks for your response - I understand the permanent token situation now. - However, I have removed the Whatsapp integration from Odoo now: not being able to use on my mobile was too restrictive and the template issue is just irritating when you just need to communicate fast with customers. I shall wait until Meta change the rules to allow these things....

You need to create a permanent token so that it doesn’t expire each time. Additionally, you can create a template that starts with, for example: 'Good day, following up on what we discussed {{1}}', where {{1}} can be replaced with what you want to communicate to the contact.