What is AS4 Adapter in SAP CPI?
The AS4 adapter in SAP Cloud Platform Integration (CPI) is a secure and reliable protocol for exchanging business documents with external partners. It is based on the AS4 (Applicability Statement 4) protocol, which is part of the OASIS e-Business Messaging Service (ebMS) specification. The AS4 adapter supports two types of message exchange patterns (MEPs): message pushing and selective message pulling.
Message Pushing
In message pushing, the AS4 adapter is the sending message handler (MSH). It initiates the communication and sends business documents to the receiving MSH. The receiving MSH acknowledges the receipt of the documents.
Selective Message Pulling
In selective message pulling, the AS4 adapter is the receiving MSH. It initiates the communication and sends requests for specific business documents to the sending MSH. The sending MSH responds with the requested documents.
Key Features of the AS4 Adapter
Secure communication: The AS4 adapter uses WS-Security for signing, encryption, and non-repudiation of messages.
Payload agnostic: The AS4 adapter supports all types of message payloads, including XML, EDI, and plain text.
Payload compression: The AS4 adapter supports GZip compression for reducing message size.
SAML token authentication: The AS4 adapter uses SAML tokens for authentication and authorization between the sending and receiving MSHs.
Use Cases for the AS4 Adapter
e-Commerce: The AS4 adapter is commonly used for exchanging purchase orders, invoices, and other business documents in e-commerce scenarios.
e-Governance: The AS4 adapter is also used for exchanging documents in e-governance applications, such as tax returns and business licenses.
B2B integration: The AS4 adapter can be used to integrate SAP applications with external systems, such as ERP, CRM, and SCM systems.
Overall, the AS4 adapter is a powerful and flexible tool for secure and reliable B2B integration. It is a valuable addition to the SAP CPI toolkit for organizations that need to connect with external partners.
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