Request SNS subscription confirmation again via API/SDK

Status quo

When an SNS subscription is still pending confirmation, you can re-send the confirmation via the management console (button: "Request confirmation").

Question

Is it possible to re-send the confirmation request via API/SDK?

Background

We offer our customers to create an SNS subscription for them to an SQS owned by our customer. Therefore, we need our customer to confirm the subscription with the message they receive in their SQS queue. However, the customer has to set up a policy first, that allows our SNS to send messages to their SQS queue (including the first confirmation request message). When the customer forgets to do this first, we would like to offer an API for them to re-send the confirmation request after they have set up the policy for their SQS correctly.