Use DeleteCertificate with an AWS SDK or CLI

    /// <summary>
    /// Deletes an IoT certificate.
    /// </summary>
    /// <param name="certificateId">The ID of the certificate to delete.</param>
    /// <returns>True if successful, false otherwise.</returns>
    public async Task<bool> DeleteCertificateAsync(string certificateId)
    {
        try
        {
            // First, update the certificate to inactive state
            var updateRequest = new UpdateCertificateRequest
            {
                CertificateId = certificateId,
                NewStatus = CertificateStatus.INACTIVE
            };
            await _amazonIoT.UpdateCertificateAsync(updateRequest);

            // Then delete the certificate
            var deleteRequest = new DeleteCertificateRequest
            {
                CertificateId = certificateId
            };

            await _amazonIoT.DeleteCertificateAsync(deleteRequest);
            _logger.LogInformation($"Deleted certificate {certificateId}");
            return true;
        }
        catch (Amazon.IoT.Model.ResourceNotFoundException ex)
        {
            _logger.LogError($"Cannot delete certificate - resource not found: {ex.Message}");
            return false;
        }
        catch (Exception ex)
        {
            _logger.LogError($"Couldn't delete certificate. Here's why: {ex.Message}");
            return false;
        }
    }

//! Delete a certificate.
/*!
  \param certificateID: The ID of a certificate.
  \param clientConfiguration: AWS client configuration.
  \return bool: Function succeeded.
 */
bool AwsDoc::IoT::deleteCertificate(const Aws::String &certificateID,
                                    const Aws::Client::ClientConfiguration &clientConfiguration) {
    Aws::IoT::IoTClient iotClient(clientConfiguration);

    Aws::IoT::Model::DeleteCertificateRequest request;
    request.SetCertificateId(certificateID);

    Aws::IoT::Model::DeleteCertificateOutcome outcome = iotClient.DeleteCertificate(
            request);

    if (outcome.IsSuccess()) {
        std::cout << "Successfully deleted certificate " << certificateID << std::endl;
    }
    else {
        std::cerr << "Error deleting certificate " << certificateID << ": " <<
                  outcome.GetError().GetMessage() << std::endl;
    }

    return outcome.IsSuccess();
}

To delete a device certificate

The following delete-certificate example deletes the device certificate with the specified ID.

aws iot delete-certificate \
    --certificate-id c0c57bbc8baaf4631a9a0345c957657f5e710473e3ddbee1428d216d54d53ac9

This command produces no output.

For more information, see DeleteCertificate in the AWS IoT API Reference.

    /**
     * Deletes a certificate asynchronously.
     *
     * @param certificateArn The ARN of the certificate to delete.
     *
     * This method initiates an asynchronous request to delete a certificate.
     * If the deletion is successful, it prints a confirmation message.
     * If an exception occurs, it prints the error message.
     */
    public void deleteCertificate(String certificateArn) {
        DeleteCertificateRequest certificateProviderRequest = DeleteCertificateRequest.builder()
            .certificateId(extractCertificateId(certificateArn))
            .build();

        CompletableFuture<DeleteCertificateResponse> future = getAsyncClient().deleteCertificate(certificateProviderRequest);
        future.whenComplete((voidResult, ex) -> {
            if (ex == null) {
                System.out.println(certificateArn + " was successfully deleted.");
            } else {
                Throwable cause = ex.getCause();
                if (cause instanceof IotException) {
                    System.err.println(((IotException) cause).awsErrorDetails().errorMessage());
                } else {
                    System.err.println("Unexpected error: " + ex.getMessage());
                }
            }
        });

        future.join();
    }

suspend fun deleteCertificate(certificateArn: String) {
    val certificateProviderRequest =
        DeleteCertificateRequest {
            certificateId = extractCertificateId(certificateArn)
        }
    IotClient.fromEnvironment { region = "us-east-1" }.use { iotClient ->
        iotClient.deleteCertificate(certificateProviderRequest)
        println("$certificateArn was successfully deleted.")
    }
}

class IoTWrapper:
    """Encapsulates AWS IoT actions."""

    def __init__(self, iot_client, iot_data_client=None):
        """
        :param iot_client: A Boto3 AWS IoT client.
        :param iot_data_client: A Boto3 AWS IoT Data Plane client.
        """
        self.iot_client = iot_client
        self.iot_data_client = iot_data_client

    @classmethod
    def from_client(cls):
        iot_client = boto3.client("iot")
        iot_data_client = boto3.client("iot-data")
        return cls(iot_client, iot_data_client)

    def delete_certificate(self, certificate_id):
        """
        Deletes an AWS IoT certificate.

        :param certificate_id: The ID of the certificate to delete.
        """
        try:
            self.iot_client.update_certificate(
                certificateId=certificate_id, newStatus="INACTIVE"
            )
            self.iot_client.delete_certificate(certificateId=certificate_id)
            logger.info("Deleted certificate %s.", certificate_id)
        except ClientError as err:
            if err.response["Error"]["Code"] == "ResourceNotFoundException":
                logger.error("Cannot delete certificate. Resource not found.")
                return
            logger.error(
                "Couldn't delete certificate. Here's why: %s: %s",
                err.response["Error"]["Code"],
                err.response["Error"]["Message"],
            )
            raise