We're in the process of migrating all of our content from one site to another site and I'm trying to figure out how to programmatically create a bunch of redirects from the old URL to the new URL on a different domain.  What I'm trying to do is similar to what I can manually do via Safe Redirect Manager, but I'm having trouble finding how to do it programmatically from PHP.

I'm aware of the safe_redirect method, but I think that only applies to the current page being viewed - not something that is persisted for a bunch of URLs like Safe Redirect Manager.

To clarify - we're not trying to replicate the functionality of Safe Redirect Manager.  We intend to keep that running on the old site - we're just looking for help on how to create an instance of the Safe Redirect Manager's post type for each URL we need to redirect.