| CPC H04L 67/51 (2022.05) [H04L 41/0806 (2013.01); H04L 41/0895 (2022.05)] | 20 Claims |

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1. A method performed by a common application program interface (API) framework core function (CCF) for discovering an API serving a user equipment (UE), the method comprising:
receiving, from an API publishing function (APF), a service API publish request message including first service API information, for publishing the first service API information, wherein the first service API information includes a list of UE internet protocol (IP) addresses;
storing the first service API information in an API registry;
receiving, from an API invoker, a service API discover request message including a UE IP address for discovering at least one service API;
retrieving the first service API information from the API registry based on the UE IP address, wherein the first service API information corresponds to the service API discover request message; and
transmitting, to the API invoker, a service API discover response message including the first service API information.
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