Index: MessagePayloads.h
===================================================================
diff -u -r28a2f48fe687f771be0569cc9e91d2356ce3dc22 -r3eac0013fd30f4a850ec0637320708aa98235907
--- MessagePayloads.h	(.../MessagePayloads.h)	(revision 28a2f48fe687f771be0569cc9e91d2356ce3dc22)
+++ MessagePayloads.h	(.../MessagePayloads.h)	(revision 3eac0013fd30f4a850ec0637320708aa98235907)
@@ -7,8 +7,8 @@
 *
 * @file    MessagePayloads.h
 *
-* @author  (last)      Michael Garthwaite
-* @date    (last)      11-Sep-2025
+* @author  (last)      Varshini Nagabooshanam
+* @date    (last)      12-Jan-2026
 *
 * @author  (original)  Sean Nash
 * @date    (original)  07-Nov-2024
@@ -42,8 +42,10 @@
     F32  ufRate;                                        ///< Set ultrafiltration rate (mL/min).
     F32  dialTemp;                                      ///< Set dialysate temperature (deg C).
     BOOL bypassDialyzer;                                ///< Flag indicating whether bypass of dialyzer is requested.
-    U32  acidType;                                      ///< Type of acid being used to make dialysate.
-    U32  bicarbType;                                    ///< Type of bicarb being used to make dialysate.
+    F32  acidKPlus;                                     ///< Set acid K+ being used to make dialysate.
+    F32  acidCa2Plus;                                   ///< Set acid Ca2+ being used to make dialysate.
+    U32  sodium;                                        ///< Set sodium being used to make dialysate.
+    U32  bicarbonate;                                   ///< Set bicarbonate being used to make dialysate.
 } DIALYSATE_DELIVERY_REQ_PAYLOAD_T;
 
 /// Payload record structure for requesting pre generate dialysate.