Integration with Crossref GrantID

[mariapraetzellis]

We need to add the ability to connect a DMP to a Crossref GrantID.

This is a new service of Crossref, so most grants will not have IDs yet, so this is a lower priority in relation to supporting other identifiers (re3 data/licensees, ORCID...).

Questions to consider:

• Look into ways to have the ID automatically populate once a project is assigned a GrantID. Can we ping the Crossref API periodically to check for this?
• Should also be possible for the user to manually add the ID to the DMP