diff --git a/crates/api_models/src/payments.rs b/crates/api_models/src/payments.rs
index 3b85644553d..a4f052549bd 100644
--- a/crates/api_models/src/payments.rs
+++ b/crates/api_models/src/payments.rs
@@ -2019,7 +2019,7 @@ pub struct BankTransferNextStepsData {
 #[derive(Clone, Debug, Eq, PartialEq, serde::Serialize, serde::Deserialize, ToSchema)]
 pub struct VoucherNextStepData {
     /// Voucher expiry date and time
-    pub expires_at: Option<String>,
+    pub expires_at: Option<i64>,
     /// Reference number required for the transaction
     pub reference: String,
     /// Url to download the payment instruction
@@ -2087,8 +2087,8 @@ pub struct MultibancoTransferInstructions {
 
 #[derive(Clone, Debug, Eq, PartialEq, serde::Serialize, serde::Deserialize, ToSchema)]
 pub struct DokuBankTransferInstructions {
-    #[schema(value_type = String, example = "2023-07-26T17:33:00-07-21")]
-    pub expires_at: Option<String>,
+    #[schema(value_type = String, example = "1707091200000")]
+    pub expires_at: Option<i64>,
     #[schema(value_type = String, example = "122385736258")]
     pub reference: Secret<String>,
     #[schema(value_type = String)]
diff --git a/crates/common_utils/src/custom_serde.rs b/crates/common_utils/src/custom_serde.rs
index edbfa143a66..e4608c4f371 100644
--- a/crates/common_utils/src/custom_serde.rs
+++ b/crates/common_utils/src/custom_serde.rs
@@ -84,6 +84,53 @@ pub mod iso8601 {
             })
         }
     }
+    /// Use the well-known ISO 8601 format which is without timezone when serializing and deserializing an
+    /// [`Option<PrimitiveDateTime>`][PrimitiveDateTime].
+    ///
+    /// [PrimitiveDateTime]: ::time::PrimitiveDateTime
+    pub mod option_without_timezone {
+        use serde::{de, Deserialize, Serialize};
+        use time::macros::format_description;
+
+        use super::*;
+
+        /// Serialize an [`Option<PrimitiveDateTime>`] using the well-known ISO 8601 format which is without timezone.
+        pub fn serialize<S>(
+            date_time: &Option<PrimitiveDateTime>,
+            serializer: S,
+        ) -> Result<S::Ok, S::Error>
+        where
+            S: Serializer,
+        {
+            date_time
+                .map(|date_time| {
+                    let format =
+                        format_description!("[year]-[month]-[day]T[hour]:[minute]:[second]");
+                    date_time.assume_utc().format(format)
+                })
+                .transpose()
+                .map_err(S::Error::custom)?
+                .serialize(serializer)
+        }
+
+        /// Deserialize an [`Option<PrimitiveDateTime>`] from its ISO 8601 representation.
+        pub fn deserialize<'a, D>(deserializer: D) -> Result<Option<PrimitiveDateTime>, D::Error>
+        where
+            D: Deserializer<'a>,
+        {
+            Option::deserialize(deserializer)?
+                .map(|time_string| {
+                    let format =
+                        format_description!("[year]-[month]-[day]T[hour]:[minute]:[second]");
+                    PrimitiveDateTime::parse(time_string, format).map_err(|_| {
+                        de::Error::custom(format!(
+                            "Failed to parse PrimitiveDateTime from {time_string}"
+                        ))
+                    })
+                })
+                .transpose()
+        }
+    }
 }
 
 /// Use the UNIX timestamp when serializing and deserializing an
diff --git a/crates/router/src/connector/adyen/transformers.rs b/crates/router/src/connector/adyen/transformers.rs
index 8da5d15c444..b141634d46f 100644
--- a/crates/router/src/connector/adyen/transformers.rs
+++ b/crates/router/src/connector/adyen/transformers.rs
@@ -370,7 +370,12 @@ pub struct AdyenPtsAction {
     reference: String,
     download_url: Option<Url>,
     payment_method_type: PaymentType,
-    expires_at: Option<String>,
+    #[serde(rename = "expiresAt")]
+    #[serde(
+        default,
+        with = "common_utils::custom_serde::iso8601::option_without_timezone"
+    )]
+    expires_at: Option<PrimitiveDateTime>,
     initial_amount: Option<Amount>,
     pass_creation_token: Option<String>,
     total_amount: Option<Amount>,
@@ -3434,6 +3439,10 @@ pub fn get_present_to_shopper_metadata(
     response: &PresentToShopperResponse,
 ) -> errors::CustomResult<Option<serde_json::Value>, errors::ConnectorError> {
     let reference = response.action.reference.clone();
+    let expires_at = response
+        .action
+        .expires_at
+        .map(|time| utils::get_timestamp_in_milliseconds(&time));
 
     match response.action.payment_method_type {
         PaymentType::Alfamart
@@ -3446,7 +3455,7 @@ pub fn get_present_to_shopper_metadata(
         | PaymentType::Seicomart
         | PaymentType::PayEasy => {
             let voucher_data = payments::VoucherNextStepData {
-                expires_at: response.action.expires_at.clone(),
+                expires_at,
                 reference,
                 download_url: response.action.download_url.clone(),
                 instructions_url: response.action.instructions_url.clone(),
@@ -3470,7 +3479,7 @@ pub fn get_present_to_shopper_metadata(
                 Box::new(payments::DokuBankTransferInstructions {
                     reference: Secret::new(response.action.reference.clone()),
                     instructions_url: response.action.instructions_url.clone(),
-                    expires_at: response.action.expires_at.clone(),
+                    expires_at,
                 }),
             );
 
diff --git a/openapi/openapi_spec.json b/openapi/openapi_spec.json
index d516eeed4cc..9afd5182529 100644
--- a/openapi/openapi_spec.json
+++ b/openapi/openapi_spec.json
@@ -7738,7 +7738,7 @@
         "properties": {
           "expires_at": {
             "type": "string",
-            "example": "2023-07-26T17:33:00-07-21"
+            "example": "1707091200000"
           },
           "reference": {
             "type": "string",