The long-term aspiration of the Sustainable Erasmus+ Travel (SET) project is to improve students' opportunities to engage in more environmentally sustainable habits during their mobility and to change their mindset regarding the trip to the mobility destination as a transformative experience in itself. In the framework of the project, among other activities, we aim to develop a prototype to recognise green soft skills. This report complements the Green competencies online repository, which presents in an interactive and innovative way the comprehensive list of the green transversal skills applied and/or acquired by students when travelling sustainably. The document at hand provides information on the methodology undertaken to materialise the repository, elaborates on the categorisation of all 19 competencies, and concludes with some initial takeaways and future actions.