Best way to programmatically import GL Journal into EBS R12

Hi

EBS version R12.

We are looking to import GL Journal data into EBS from an outside source. The data will be first input or uploaded to a web interface and then we are looking to send to Oracle via API. This can be presented in whatever format is required for Oracle. What is the best way to do this? I'm assuming there are no REST APIs for this version like we would use in Fusion.

Ideally we'd like to call either call a REST API or a pl/sql package to first validate the data, so that we can send this back to the client and have any corrections made before the entries are processed. I've had a through the package list and am not sure exactly which GL_JE_XX or GL_JOURNAL_XX package I should be using (I'm assuming it's one of these).