diff --git a/icepyx/core/harmony.py b/icepyx/core/harmony.py
index cc812b00..33274a5a 100644
--- a/icepyx/core/harmony.py
+++ b/icepyx/core/harmony.py
@@ -2,13 +2,22 @@
 
 import harmony
 
+from icepyx.core.auth import EarthdataAuthMixin
 
-def get_capabilities(concept_id: str) -> dict[str, Any]:
-    capabilities_request = harmony.CapabilitiesRequest(concept_id=concept_id)
-    # TODO: This will work if the user has a .netrc file available but the other
-    # auth options might fail. We might need to add harmony client auth to the
-    # icepyx auth package.
-    harmony_client = harmony.Client()
-    response = harmony_client.submit(capabilities_request)
 
-    return response
+class HarmonyApi(EarthdataAuthMixin):
+    def __init__(self):
+        # initialize authentication properties
+        EarthdataAuthMixin.__init__(self)
+        self.harmony_client = harmony.Client(
+            auth=(
+                self.auth.username,
+                self.auth.password,
+            ),
+        )
+
+    def get_capabilities(self, concept_id: str) -> dict[str, Any]:
+        capabilities_request = harmony.CapabilitiesRequest(concept_id=concept_id)
+        response = self.harmony_client.submit(capabilities_request)
+
+        return response