For legacy API keys (those created before Jul 7, 2022), you must use the
aftership-api-keyheader key. Legacy API keys also do not support AES or RSA authentication signatures. For more information, check authentication.
An API key is a token that you provide when making API calls. Include the token in a header parameter called as-api-key.
Example: as-api-key: 123
OAS Schema can be downloaded here