SMS - Delete Message Definition
DELETE https://{{et_subdomain}}.rest.marketingcloudapis.com/messaging/v1/sms/definitions/{{definitionKey}}
Deletes a message definition. You can't restore a deleted definition. The deleted definition is archived, and a delete location of the definition key is provided in the response for reference. You can reuse a deleted definition key because the information associated with it is copied to a new unique identifier.
RESPONSES
status: OK
{"requestId":"8cab77c4-9407-4d30-9141-76d88ff16c95","message":"Success","deletedDefinitionKey":"96a7334a-6119-4156-9b3e-d3b7aa4b2671"}