I worked as a computer engineer intern at Tosçelik Profil ve Sac company in Sarıseki, İskenderun, Hatay, Turkey during the summer term. S4/HANA-SAP BASIC-SAP FI CO; It provides access from the interface to the operations to be performed on the SAP Server. Application system that can enable the factory to manage its job functions from a single point. In the free leave report, the factory employees were able to delete, add, update the reports to the table. MS Biztalk Server; It provides a structure that not only communicates between different platforms, but also makes the data suitable for the systems, that is, it acts as a bridge between other systems without depending on a specific program.For b2b and in-house document transfer applications over the Internet, the server with xml and encryption features. In the file received from the bank to the company, there are areas determined in accordance with the rules of the direct debit system (dbs). In these fields, there is information such as the customer's limit, guaranteed invoice amount, available limit, blocked amount. When SAP wants to send an invoice to the bank, it exits the SAP system and comes to the biztalk program and is left in the SFTP/FTP area of the relevant bank. Separate receive and send ports specific to each bank are defined and sftp connections are written into these ports. On the development side (C#), the ports and definitions of each bank are made. We upload it to the Biztalk admin panel screen and manage it from there.