Frequently Asked Questions

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First Steps

For whom is the Developer Portal intended?

Our Developer Portal is for all companies that want to develop an interface to DATEV software (whether coding or designing). The content and features of the portal are therefore not only accessible for our DATEV members (members?! More information here).

How can I register on the portal?

The registration on the portal takes place automatically with the first login. A DATEV authentication medium (SmartCard/SmartLogin/Benutzerkonto) is required for the login. If you already own such a medium, you can log in directly from the start page.

No DATEV authentication medium yet? Then you can order a medium directly via the start page (see button "Order DATEV Benutzerkonto"). Please note that this is associated with a processing time of up to 3 days.

What can I expect after login?

In our portal there is a public and a chargeable area. After the first successful login you will be taken to the public area. Here you can already see first API documentations (e.g. API for DATEV Kassenarchiv online, API Login with DATEV) as well as our blog.

To be able to use all contents and features (see our Leistungsbeschreibung on, the "Enterprise License" (25,00€ net monthly, minimum duration 12 months) has to be ordered directly via the portal. Further information can be found in the FAQs of the public and chargeable area.

Login problems?

1. You cannot log in with the desired DATEV authentication medium?

Here it helps to empty the browser cache and/or to explicitly define the authentication medium here.

2. You receive the following error message when logging in?

"Die E-Mail-Adresse <your e-mail address> wird bereits verwendet. Die Anmeldung über DATEV konnte aufgrund eines Fehlers nicht abgeschlossen werden."

In principle, it is possible to log in using different DATEV authentication media with identical e-mail addresses. There are problems if you have different DATEV authentication media with identical e-mail addresses on different Beraternummern (customer number from DATEV). The registration of a user at the Developer Portal is automatically done with the first login. If, after the first registration, you try to log in with a different medium using the same e-mail address but a different Beraternummer, this error occurs.

Remedy: Either you use the medium from the first registration or you write to with subject "New registration for <your e-mail address>".  We will then delete your first registration and as soon as you receive a reply from us, you can re-register/login with the desired medium.

You have another error/problem constellation? Simply write to us: