Presentation at the PIDfest Conference 2024. Lightning Talk presentation about the French multidisciplinary open archive HAL (https://hal.science/). In this presentation, we will discuss how PIDs are managed in HAL and how they contribute to quality metadata. HAL is a multidisciplinary French national open archive, published or not published, HAL contains more than 1.250.000 files of articles, preprints, conference papers, images etc… HAL is chosen by the whole French scientific and university community for the dissemination of knowledge. HAL helps and encourages its contributors to provide high quality metadata about publications, these metadata are mandatory to enhance the dissemination of the articles, to improve their discoverability and also to assist institutions toward the path of open access. HAL deposit form is quite exhaustive, in fact contributors can provide many metadata about a publication, for instance authors can be associated with many identifiers, same applies to author affiliations, journals, funding agencies.. , providing identifiers for these entities helps to avoid duplicates and to have accurate data which would require a considerable curation effort otherwise. In order to help HAL contributors and leverage the process of depositing in HAL, we use different techniques such as extracting metadata from the full-text or use metadata providers like CrossRef API , PubMed , arXiv… , the metadata for a given article is fetched using available interfaces and in case this metadata contains PIDs , for instance ORCIDs for authors, or RORs for organizations, this helps to avoid relying on approximate matching strategies which can lead to introducing (when matching fails) duplicates to HAL master data or even erroneous data, this mechanism is crucial especially to provide up to date resumes for researchers and collections for organizations.