diff --git a/README.md b/README.md
index 5879c41..55cae8e 100644
--- a/README.md
+++ b/README.md
@@ -31,7 +31,7 @@ In order for this to be set up, some key environment variables needs to be inser
 secrets. Each different model and protected branch has its own set of secrets which allows for flexibility
 between different pipelines.
 
-For example, for the branch sap_change-dev, the prefix=SAP_CHANGE_DEV, and the following secrets are:
+For example, for the branch sap-dev, the prefix=SAP_DEV, and the following secrets are:
 
 - {prefix}_ECR_URI, which is the URI of the ECR repository to push to. For example, for the
    sap change model this is the lambda-sap-prediction-dev repository.
@@ -58,7 +58,7 @@ First, navigate to the root directory of the repository. Open a terminal and exe
 2. command to build the Docker image:
 
 ```bash
-docker build -t sap_change -f deployment/Dockerfile.prediction.lambda .
+docker build -t sap -f deployment/Dockerfile.prediction.lambda .
 ```
 
 This will build a Docker image tagged as sap_change using the Dockerfile.prediction.lambda located
@@ -68,7 +68,7 @@ in the deployment directory.
 Once the image is built, you can run it using the following command:
 
 ```bash
-docker run -p 9000:8080 -v ~/.aws/credentials:/root/.aws/credentials:ro -e RUNTIME_ENVIRONMENT=dev sap_change
+docker run -p 9000:8080 -v ~/.aws/credentials:/root/.aws/credentials:ro -e RUNTIME_ENVIRONMENT=dev -e PREDICTIONS_BUCKET=retrofit-sap-predictions-dev sap
 ```
 This command does the following:
 
@@ -79,6 +79,7 @@ Sets the RUNTIME_ENVIRONMENT variable to dev.
 To test the Lambda function, use the following curl command:
 
 ```json
-curl -XPOST "http://localhost:9000/2015-03-31/functions/function/invocations" -d '{"body": "{\"file_location\": \"s3://retrofit-data-dev/model_build_data/change_data/rdsap_full/test_data_with_id.parquet\", \"property_id\": 1, \"portfolio_id\": 4, \"created_at\": \"now\"}"'
+curl -XPOST "http://localhost:9000/2015-03-31/functions/function/invocations" -d '{"body": "{\"file_location\": \"s3://retrofit-data-dev/sap_change_model/one_sample_test_dataset.parquet\", \"property_id\": 1, \"portfolio_id\": 4, \"created_at\": \"now\"}"}'
 ```
+
 This will send a POST request to the running Lambda function and pass in the required data as JSON.
diff --git a/deployment/handlers/prediction_app.py b/deployment/handlers/prediction_app.py
index 6f9d162..36a906c 100644
--- a/deployment/handlers/prediction_app.py
+++ b/deployment/handlers/prediction_app.py
@@ -107,6 +107,7 @@ def handler(event, context):
             predictions_column_name=generate_predictions_params[
                 "predictions_column_name"
             ],
+            identifier_column=generate_predictions_params["identifier_column"],
         )
 
         return {
diff --git a/modules/ml-pipeline/src/pipeline/configs/settings.yaml b/modules/ml-pipeline/src/pipeline/configs/settings.yaml
index a84c095..ce7ed2c 100644
--- a/modules/ml-pipeline/src/pipeline/configs/settings.yaml
+++ b/modules/ml-pipeline/src/pipeline/configs/settings.yaml
@@ -43,6 +43,7 @@ default:
     test_data_filepath: ./data/prepared_data/test.parquet
     predictions_output_filepath: ./data/predictions/predictions.parquet
     predictions_column_name: predictions
+    identifier_column: id
 
   generate_metrics:
     dataclient_type: local
diff --git a/modules/ml-pipeline/src/pipeline/core/DataClient.py b/modules/ml-pipeline/src/pipeline/core/DataClient.py
index 28ffff7..53f4072 100644
--- a/modules/ml-pipeline/src/pipeline/core/DataClient.py
+++ b/modules/ml-pipeline/src/pipeline/core/DataClient.py
@@ -142,9 +142,15 @@ class AWSS3Client:
         buffer = BytesIO()
         obj.to_parquet(buffer, index=False)
 
+        # Reset the buffer position to the beginning
+        buffer.seek(0)
+
         bucket, key = location.strip("s3://").split("/", 1)
         self.client.upload_fileobj(buffer, bucket, key)
 
+        # Close the buffer
+        buffer.close()
+
     def _load_parquet(self, location: str, load_config: dict) -> pd.DataFrame:
         """
         Load a parquet file
diff --git a/modules/ml-pipeline/src/pipeline/generate_predictions.py b/modules/ml-pipeline/src/pipeline/generate_predictions.py
index 85b3022..83ea103 100644
--- a/modules/ml-pipeline/src/pipeline/generate_predictions.py
+++ b/modules/ml-pipeline/src/pipeline/generate_predictions.py
@@ -14,6 +14,7 @@ def generate_predictions(
     test_data_filepath: str,
     predictions_output_filepath: str,
     predictions_column_name: str,
+    identifier_column: str = "id",
 ):
     """
     For a given model, we generate prediction and evaluate this against the true target
@@ -52,6 +53,12 @@ def generate_predictions(
     predictions_df = pd.DataFrame(predictions)
     predictions_df.columns = [predictions_column_name]
 
-    output_dataclient.save_data(
-        obj=predictions_df, location=predictions_output_filepath, save_config=None
+    output_df = (
+        pd.concat([test_data[identifier_column], predictions_df], axis=1)
+        if identifier_column in test_data.columns
+        else predictions_df
+    )
+
+    output_dataclient.save_data(
+        obj=output_df, location=predictions_output_filepath, save_config=None
     )