Contribution payments and information are two important channels of lobbying influence. This survey analyzes what is known about these channels in Germany from a political economy perspective. Based on a discussion of the empirical literature and the available data, I argue that the state of empirical knowledge about lobbying in Germany is rather limited. To improve our understanding of the lobbying process, I identify research gaps and discuss potential methodological approaches which can be suitable to address these questions. Also, I discuss the role of party donations and temporary employment of bureaucratic staff, based on two novel data sets. The analysis indicates that party donations might play a role as a means to achieve access; in contrast, the temporary exchange of employees in the public administration seems to be of rather less importance in informational lobbying.