The API Stripe.importsubscription returns authorization failed

A call to the importsubscription API wasn't completed successfully due to an authorization failed issue:

cv api stripe.importsubscription subscription=sub_XXXXXXX ppid=1 contact_id=1234

{
    "error_code": "unauthorized",
    "entity": "Stripe",
    "action": "importcharge",
    "is_error": 1,
    "error_message": "Authorization failed"
}