diff --git a/satrs/src/action.rs b/satrs/src/action.rs
index 7caeaa6..b35a48d 100644
--- a/satrs/src/action.rs
+++ b/satrs/src/action.rs
@@ -1,4 +1,8 @@
-use crate::{pool::StoreAddr, TargetId};
+use crate::{
+    params::{Params, ParamsHeapless},
+    pool::StoreAddr,
+    TargetId,
+};
 
 pub type ActionId = u32;
 
@@ -43,21 +47,29 @@ impl TargetedActionRequest {
 
 /// A reply to an action request.
 #[non_exhaustive]
-#[derive(Clone, Eq, PartialEq, Debug)]
+#[derive(Clone, Debug)]
 pub enum ActionReply {
-    CompletionFailed(ActionId),
+    CompletionFailed {
+        id: ActionId,
+        reason: Params,
+    },
     StepFailed {
         id: ActionId,
         step: u32,
+        reason: Params,
     },
     Completed(ActionId),
     #[cfg(feature = "alloc")]
     CompletedStringId(alloc::string::String),
     #[cfg(feature = "alloc")]
-    CompletionFailedStringId(alloc::string::String),
+    CompletionFailedStringId {
+        id: alloc::string::String,
+        reason: Params,
+    },
     #[cfg(feature = "alloc")]
     StepFailedStringId {
         id: alloc::string::String,
         step: u32,
+        reason: Params,
     },
 }
diff --git a/satrs/src/params.rs b/satrs/src/params.rs
index 1279015..90d7028 100644
--- a/satrs/src/params.rs
+++ b/satrs/src/params.rs
@@ -618,6 +618,42 @@ impl From<&str> for Params {
     }
 }
 
+/// Please note while [WritableToBeBytes] is implemented for [Params], the default implementation
+/// will not be able to process store parameters.
+impl WritableToBeBytes for Params {
+    fn raw_len(&self) -> usize {
+        match self {
+            Params::Heapless(p) => match p {
+                ParamsHeapless::Raw(raw) => raw.raw_len(),
+                ParamsHeapless::EcssEnum(enumeration) => enumeration.raw_len(),
+            },
+            Params::Store(_) => 0,
+            Params::Vec(vec) => vec.len(),
+            Params::String(string) => string.len(),
+        }
+    }
+
+    fn write_to_be_bytes(&self, buf: &mut [u8]) -> Result<usize, ByteConversionError> {
+        match self {
+            Params::Heapless(p) => match p {
+                ParamsHeapless::Raw(raw) => raw.write_to_be_bytes(buf),
+                ParamsHeapless::EcssEnum(enumeration) => enumeration.write_to_be_bytes(buf),
+            },
+            Params::Store(_) => Ok(0),
+            Params::Vec(vec) => {
+                // TODO: size checks.
+                buf[0..vec.len()].copy_from_slice(vec);
+                Ok(vec.len())
+            }
+            Params::String(string) => {
+                // TODO: size checks
+                buf[0..string.len()].copy_from_slice(string.as_bytes());
+                Ok(string.len())
+            }
+        }
+    }
+}
+
 #[cfg(test)]
 mod tests {
     use super::*;
diff --git a/satrs/src/pus/action.rs b/satrs/src/pus/action.rs
index 2ee4815..8d43d9c 100644
--- a/satrs/src/pus/action.rs
+++ b/satrs/src/pus/action.rs
@@ -1,4 +1,7 @@
-use crate::{action::ActionRequest, TargetId};
+use crate::{
+    action::{ActionId, ActionReply, ActionRequest},
+    TargetId,
+};
 
 use super::verification::{TcStateAccepted, VerificationToken};
 
@@ -61,10 +64,17 @@ pub mod alloc_mod {
 #[cfg(feature = "std")]
 #[cfg_attr(doc_cfg, doc(cfg(feature = "std")))]
 pub mod std_mod {
-    use crate::pus::{
-        get_current_cds_short_timestamp, verification::VerificationReportingProvider,
-        EcssTcInMemConverter, EcssTcReceiverCore, EcssTmSenderCore, GenericRoutingError,
-        PusPacketHandlerResult, PusPacketHandlingError, PusRoutingErrorHandler, PusServiceHelper,
+    use hashbrown::HashMap;
+
+    use crate::{
+        params::WritableToBeBytes,
+        pus::{
+            get_current_cds_short_timestamp,
+            verification::{FailParams, TcStateStarted, VerificationReportingProvider},
+            EcssTcInMemConverter, EcssTcReceiverCore, EcssTmSenderCore, GenericRoutingError,
+            PusPacketHandlerResult, PusPacketHandlingError, PusRoutingErrorHandler,
+            PusServiceHelper,
+        },
     };
 
     use super::*;
@@ -175,6 +185,40 @@ pub mod std_mod {
             Ok(PusPacketHandlerResult::RequestHandled)
         }
     }
+    pub struct PusService8ReplyHandler<VerificationReporter: VerificationReportingProvider> {
+        active_requests: HashMap<TargetId, ActionId>,
+        verification_reporter: VerificationReporter,
+        fail_data_buf: alloc::vec::Vec<u8>,
+    }
+
+    impl<VerificationReporter: VerificationReportingProvider>
+        PusService8ReplyHandler<VerificationReporter>
+    {
+        pub fn add_routed_request(&mut self, target_id: TargetId, action_id: ActionId) {
+            self.active_requests.insert(target_id, action_id);
+        }
+        pub fn handle_action_reply(
+            &mut self,
+            reply: ActionReply,
+            token: VerificationToken<TcStateStarted>,
+            time_stamp: &[u8],
+        ) {
+            match reply {
+                ActionReply::CompletionFailed { id, reason } => {
+                    reason.write_to_be_bytes(self.fail_data_buf.as_mut_slice());
+                    self.verification_reporter.completion_failure(
+                        token,
+                        FailParams::new(time_stamp, failure_code, failure_data),
+                    );
+                }
+                ActionReply::StepFailed { id, step, reason } => {}
+                ActionReply::Completed(id) => {}
+                ActionReply::CompletedStringId(id) => {}
+                ActionReply::CompletionFailedStringId { id, reason } => {}
+                ActionReply::StepFailedStringId { id, step, reason } => {}
+            }
+        }
+    }
 }
 
 #[cfg(test)]