Acumatica Integration with Client ERP System

Hi, we need to perform an integration between Acumatica and IFS. The integration points are given below. How can we open an endpoint for IFS to perform these operations via GET and POST from the Acumatica end?

• Acumatica PO Transfer to IFS as IFS customer Order (GET request from IFS)
• IFS Shipment Integration to create Acumatica Proforma Invoice (POST request from IFS)
• IFS Shipment Integration to create Acumatica Purchase Receipt (POST request from IFS)
• Acumatica PO change order integration to IFS customer order (GET request from IFS)
• IFS sales part integration to create sales part in Acumatica (POST request from IFS)

Thank you.