Summary
The /api/v2/outbound/contactlists/{contactListId}/contacts/bulk/update endpoint enables users to update data for a large number of contacts within a specified contact list.
Improvement: This update introduces validation of the contact data provided in the request. Previously, the endpoint did not validate the contact information, which could lead to invalid contact data being stored. With this change, each contact update will be validated to ensure it represents a valid modification.
Effective Date
Wednesday, July 23, 2025
Issue References
[LM-3128]
Details
Currently, a backend issue exists where contact updates are validated, but validation failures do not prevent the update or trigger an error response. This allows invalid contact data to be persisted. Consequently, when these invalid contacts are used in campaigns, they fail silently, leaving users unaware of the problem.
On all other endpoints where users add contacts or edit them we enforce these validations.
Impacted Resources
/api/v2/outbound/contactlists/{contactListId}/contacts/bulk/update
Customer Impact
Customers will no longer be able to perform invalid contact updates. Instead, they will receive an error message detailing the issue. Valid update requests will continue to be processed as expected.
Contacts
@Sarah Morley @Chad McCormick