The European Central Bank (ECB) is seeking experts in payments schemes to contribute to the scheme compatibility workstream for the digital euro scheme Rulebook. This workstream is part of the efforts to draft the Rulebook for the digital euro scheme. The main goal of the workstream is to propose a design for the Rulebook that will ensure the compatibility of the digital euro with existing scheme solutions. This proposal should include an impact analysis of existing scheme solutions and recommendations for specific sections of the Rulebook, such as the scope and interplay of the digital euro scheme and technical scheme requirements.