There are more AWS SDK examples available in the [AWS Doc SDK Examples](https://github.com/awsdocs/aws-doc-sdk-examples) GitHub repo.

# Update the expiration date of a CPPO using an AWS SDK
Update the expiration date of a CPPO

The following code examples show how to update the expiration date of a CPPO to give buyers more time to evaluate and accept the offer.

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#### [ Java ]

**SDK for Java 2.x**  
 There's more on GitHub. Find the complete example and learn how to set up and run in the [AWS Marketplace API Reference Code Library](https://github.com/aws-samples/aws-marketplace-reference-code/tree/main/java#catalog-api-reference-code) repository. 
To run this example, pass the following JSON changeset to `RunChangesets` in *Utilities to start a changeset* from the **Utilities** section.  

```
{
    "Catalog": "AWSMarketplace",
    "ChangeSet": [
        {
            "ChangeType": "UpdateAvailability",
            "Entity": {
                "Type": "Offer@1.0",
                "Identifier": "offer-1111111111111"
            },
            "DetailsDocument": {
                "AvailabilityEndDate": "2025-07-31"
                }
        }
    ]
}
```
+  For API details, see [StartChangeSet](https://docs.aws.amazon.com/goto/SdkForJavaV2/marketplace-catalog-2018-09-17/StartChangeSet) in *AWS SDK for Java 2.x API Reference*. 

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#### [ Python ]

**SDK for Python (Boto3)**  
 There's more on GitHub. Find the complete example and learn how to set up and run in the [AWS Marketplace API Reference Code Library](https://github.com/aws-samples/aws-marketplace-reference-code/blob/main/python##catalog-api-reference-code) repository. 

```
{
    "Catalog": "AWSMarketplace",
    "ChangeSet": [
        {
            "ChangeType": "UpdateAvailability",
            "Entity": {
                "Type": "Offer@1.0",
                "Identifier": "offer-1111111111111"
            },
            "DetailsDocument": {
                "AvailabilityEndDate": "2025-07-31"
                }
        }
    ]
}
```
Run this script to start the changeset. Helper functions are defined in *Utilities to start a changeset* from the **Utilities** section.  

```
# Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
# SPDX-License-Identifier: Apache-2.0
"""
Purpose
Shows how to use the AWS SDK for Python (Boto3) to update the expiry
date of a CPPO offer
"""


import os

import utils.start_changeset as sc
import utils.stringify_details as sd


def main(change_set=None):
    if change_set is None:
        fname = "changeset.json"
        change_set_file = os.path.join(os.path.dirname(__file__), fname)
        stringified_change_set = sd.stringify_changeset(change_set_file)

    else:
        stringified_change_set = change_set

    response = sc.usage_demo(
        stringified_change_set,
        "Update the expiry date of a CPPO offer"
    )

    return response


if __name__ == "__main__":
    main()
```
+  For API details, see [StartChangeSet](https://docs.aws.amazon.com/goto/boto3/marketplace-catalog-2018-09-17/StartChangeSet) in *AWS SDK for Python (Boto3) API Reference*. 

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