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Thank you for this requirement.
Basic Authentication to z/OS Connect EE from CICS as part of an API requester flow has been available from the start of V3 via the standard mechanisms for CICS Web Support Security.
Step 2.b in "Configuring CICS to access z/OS Connect EE to call APIs" in the z/OS Connect EE Knowledge Center has links to more information: https://www.ibm.com/support/knowledgecenter/en/SS4SVW_3.0.0/configuring/config_cics_commstub.html
As such this RFE is being closed as 'Delivered'. You may also be interested in RFE 125402 "Authentication and identity propagation for API Requesters":
http://www.ibm.com/developerworks/rfe/execute?use_case=viewChangeRequest&CR_ID=125402
This RFE aims to greatly improve and simplify security in API Requester.