Index: MessagePayloads.h
===================================================================
diff -u -rbabcf7e639e5aa9a06a6aae5d3bda45e7034de2e -r9e1f1a6979c06dafaaf5f95912de5bc25a10f86c
--- MessagePayloads.h	(.../MessagePayloads.h)	(revision babcf7e639e5aa9a06a6aae5d3bda45e7034de2e)
+++ MessagePayloads.h	(.../MessagePayloads.h)	(revision 9e1f1a6979c06dafaaf5f95912de5bc25a10f86c)
@@ -7,8 +7,8 @@
 *
 * @file    MessagePayloads.h
 *
-* @author  (last)      Raghu Kallala
-* @date    (last)      17-Apr-2026
+* @author  (last)      Sameer Kalliadan Poyil
+* @date    (last)      15-Jun-2026
 *
 * @author  (original)  Sean Nash
 * @date    (original)  07-Nov-2024
@@ -46,6 +46,7 @@
     F32  bicarbConvFactor;                              ///< Conversion factor of bicarbonate.
     U32  sodium;                                        ///< Set sodium being used to make dialysate.
     U32  bicarbonate;                                   ///< Set bicarbonate being used to make dialysate.
+    F32  substitutionRate;                              ///< Set HDF rate ( mL/min).
 } DIALYSATE_DELIVERY_REQ_PAYLOAD_T;
 
 /// Payload record structure for requesting pre generate dialysate.