Encrypted variable in Travis as the value of a secure key

Deployment
2

You cannot write:

deploy:
  api_key:
    secure: $DEPLOYMENT_KEY

Decryption happens in an early stage of the Travis build process; the encrypted value will be passed on to the app which compiles the bash script to build. Since the part that is responsible for decrypting secrets doesn’t know anything about $DEPLOYMENT_KEY, this configuration will ultimately fail.

To achieve what you are after, you can use the repository settings to define secrets.

See Environment Variables - Travis CI.

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