I’m trying to use the spreadshirt API, and I followed pretty much exaclty this guide. You can find my python script here. Each request gives OK  or CREATED . I’ve filled out api_key, etc correctly.
Some possible error sources I’m not sure about:
- my api key isn’t configured for creating (but I haven’t found any option to configure api keys)
- you have to set the design to visible or something
- you need to configure the shop somehow
Some other questions:
- Can you use already uploaded designs in products created by the api? If yes, how?
- Where can you find the design ids of already uploaded designs?