SAP B1 <> SPS commerce

I posted a similar question in the SAP B1 subreddit, but wanted to get some insight from anyone in here who’s using SPS commerce with SAP B1. What middleware/connector are you using and specifically how is your process been with automating ASNs (856) and Invoices (810) from SAP into SPS commerce? The native connector SPS commerce offers is unacceptable for ASN automation and we’re actually better off creating ASNs directly inside their Web Fulfillment portal. Looking for alternatives or suggestions on how to make this process more efficient. Thanks much.