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As of Oracle Database 12c release 1 (12.1), SQL Apply processes have access to a context namespace called LSBY_APPLY_CONTEXT.
You can use the procedures provided in the DBMS_LOGSTDBY_CONTEXT package to set and retrieve various parameters associated with LSBY_APPLY_CONTEXT.
This is useful when writing skip procedures that are registered with SQL Apply using the DBMS_LOGSTBDY.SKIP and DBMS_LOGSTDBY.SKIP_ERROR procedures.
CREATE CONTEXT lsby_apply_context USING dbms_logstdby_context;