The Blassa Business APIs require your Blassa API Key to be provided in the x-api-key header. You can easily find your key in your Blassa Business Dashboard account. Navigate to Menu >> Manage Keys.
To use the Blassa APIs, set the x-api-key value and any necessary input values as shown below.
API calls in the Blassa readme
You can also make API calls by forking the Blassa Postman collection. Set your API key in the headers to make calls.