Just played around with postermywall’s API. They only allow you to pull data so it would only be of partial use for your use case:

- To connect to APIs the Bubble’s API CONNECTOR plugin is used
- I created a free account in postermywall and created one test project. This creates an API key that is used for the GET call from Bubble’s API CONNECTOR plugin
- This is the setup in the editor with one repeating group, one text element and one image element
Hope this provides some guidance on getting data from API services 