Establishing a TLS connection Before sending the HTTP request built in the previous chapter, a secure communication channel has to be established, guaranteeing both that all data is …

Welcome to the Fiserv developer documentation, this section will give you access to all the API specifications and a place to make your initial API call. Guides Documentation aimed at …

Integration and Connection Technical connectivity options A terminal is normally connected to some kind of transport layer (host connector) which is responsible to transport the messages …

In the coming section you can expect information about general concepts. From how to establish a TLS connection, building and sending HTTP Post Requests and receiving of a response, …

This element uniquely identifies a transaction. It must be unique for each message pair (request, response). A technical void (or cancel) can use the same transaction ID. The transaction ID …

The following steps help you proceed one by one - first you setup the two factor authentication (client certificate / basic auth) so that you can run request without card present related …

3-D-Secure Learn more When using our Gateway and Fiserv as the 3-D Secure provider, the authentication is performed in-line with the existing transaction flow. The process starts by …

It serves as an alternative to traditional payment methods, such as cash, checks, or wire transfers. With PayPal, users can create an account linked to their email address and add their preferred …

Overview of common errors & explanations

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