I am trying to redirect the user to DPS for payment during a custom workflow.

I have the code with no errors, but the redirect doesnt apply.

Is this something that is possible or something that I will need to do on the client side?

public override WorkflowExecutionStatus Execute(Record record, RecordEventArgs e)
{
    /* various dps operations redacted */
    HttpContext.Current.Response.Redirect(returnUrl);
    return WorkflowExecutionStatus.Completed;
}