Here's how you can schedule/publish Pinterest pins using Notion.
First go to https://notionsocial.app and create your account
Then add your Pinterest account
After adding the Pinterest account, You should see it added in the Notion database's "Platform" property.
Now to create a Pin, You need to tell Notionsocial the board to add the pin to, You will select the board name in a "Select" property.
Notionsocial will automatically add the "Board select" property and you can also manually do it using the button on your Pinterest account card in Notionsocial.
Now you can create a Pin inside your Notion database.