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Every request the OuterProduct SDK makes is authenticated with an API key. You generate that key from the OuterProduct Console, then hand it to the SDK once via op.init(); all subsequent calls in the same process are automatically authenticated.

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Get your API key

Sign in to console.outerproduct.com and navigate to API Keys. Create a new key and copy it immediately; the console will not show the full value again after you close the dialog. Set OUTERPRODUCT_API_KEY in your shell before running your script, then call op.init() with no arguments: 
export OUTERPRODUCT_API_KEY="your-api-key"

import outerproduct as op

op.init()  # automatically reads OUTERPRODUCT_API_KEY
This keeps your key out of source code and works cleanly in CI, Docker, and hosted environments where secrets are injected as environment variables.

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Option 2: Pass the key directly

If you manage secrets programmatically (for example, fetching them from a secrets manager at runtime), pass the key as an argument to op.init(): 
import outerproduct as op

op.init(api_key="your-api-key")
Never hardcode an API key as a string literal in source code that you commit to version control. Anyone with read access to your repository can use the key to make requests against your account.

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When to call op.init()

Call op.init() once, at the start of your script or application, before any other OuterProduct SDK call. The initialized state is global to the process; you do not need to pass credentials to individual SDK functions. 
import outerproduct as op

op.init()  # must come first

dataset = op.LocalDataset.from_csv("customers.csv").upload()
model = op.reasoning.fit(dataset, task=op.Binclass(label_column="churn")).wait()
If you call any SDK function before op.init(), the SDK raises an error indicating that the client has not been initialized.