Object Store Connector provides Mule operations for interacting with object stores associated with the application in which the connector executes. It is not the mechanism for one independently deployed CloudHub application to directly operate on another application's Object Store v2 data.
For cross-application administration and access, MuleSoft provides the Object Store v2 REST APIs. These APIs support listing object stores and keys, storing and retrieving key-value pairs, and explicitly deleting keys and their values. Calls are authenticated with an Anypoint Platform bearer token and address the required organization, environment, store, partition, and key. MuleSoft's documented DELETE operation removes a specified key-value pair from the targeted Object Store v2 partition.
The CloudHub REST API manages CloudHub resources and deployments rather than application Object Store entries. The CloudHub Connector likewise does not provide the direct cross-application Object Store v2 deletion capability described here.
Therefore, application B can invoke the Object Store v2 REST API, subject to appropriate authorization and identification of application A's relevant Object Store resources, to remove values from that store.
Reference topics: Object Store v2; Object Store v2 REST APIs; partitions and keys; DELETE operations; CloudHub persistence.
Official documentation: https://docs.mulesoft.com/object-store/osv2-apis
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