Celtrino participated in a pan-European electronic invoicing project from January 2018 to June 2019. The project aimed to upgrade 10 e-invoicing solutions providers, including Celtrino, to comply with Directive 2014/55/EU, which defines a common European standard for e-invoicing. The directive mandates adoption of the standard by public sector buyers in Europe and provides benefits to suppliers such as increased productivity, reduced costs, and an expanded trading partner network. Celtrino worked with the project coordinators to adapt its digital infrastructure to support the standard's semantic and syntactic specifications.