Xaypanya/b1-api-cookbook — reverse-engineered prompt

Build me a simple but complete SAP Business One Service Layer cookbook that someone can actually use right away. I want an importable Postman collection for the full B1 Service Layer at the usual /b1s/v2 base URL, plus an environment file where I can fill in server URL, username, password, and company database.

Make the login flow handle the session automatically so after I run Login once, the rest of the requests reuse the saved session and route cookie without extra setup. Include a browsable reference for all the available services and endpoints, with practical examples for common areas like business partners, items, orders, invoices, journal entries, warehouses, and similar SAP B1 objects.

I also want the OData metadata schemas included so people can understand the entities and fields, and some beginner friendly setup docs that explain how to get started in Postman, including the note about self signed certificates if needed. If anything is unclear, look up the current SAP B1 Service Layer docs online.