Postman is an application used by many developers for testing APIs. On many (marketing) platforms, you can test API requests or webhooks directly, so Postman is not always necessary.
If you want to use Postman, apply the settings below:
Go to Environments → Globals
VARIABLE = x-api-key
TYPE = secret
INITIAL VALUE = your API key
CURRENT VALUE = your API key
For INITIAL VALUE and CURRENT VALUE, enter the API key in both fields (you can find this in the Print.one account).
Use the TEST API key if you only want to test and the LIVE API key if you really want to send one or more cards. Everything you create with the LIVE API key is actually printed and sent (and billed).
Go to Collections in Postman
Open Order Service
Choose POST Create
Go to Body
Fill in the JSON that belongs to your request here
You can find a JSON example with explanation here.