Well, Marketo has an identity endpoint to create the short-lived (60-minute) OAUTH bearer access token, however, the Client ID and Client Secret that are required to create this access token need to be added manually, and there's no API for it. You'd need to update this in your properties file (or the place where you have these hard-coded and referenced everywhere from it). Upon switching the Client ID and Client Secret with valid values, you should not see any downtime/issues with creating the access token, so your integration should not get impacted.
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