Step 1
First, you need to make sure that you have connected your the Meta Business Manager of your agency to Snikpic. Read here for the instructions.
Step 2
Then, you can send each of your client an individual link to let them share access to your agency Meta Business Manager for the following resources:
Their Facebook page
Their Instagram account
Their Facebook Ad account
Their Facebook Pixel
To generate the individual link for each of your clients:
Go to Clients > [Client name] > Integrations > Facebook integration
Select the resources you want to request access to by clicking on the 3 dots button and then "Manage"
Copy-past the public link
Send this link your client