Thank you to both of you.
The external module would definitively be useful if the 2 databases were located at the same site.
By different, I mean that one database is located at site1, for collection of the clinical information (hospital) and the other database is located at site 2, for research data collection (research institute).
Both databases are accessed with a different login as they are not owned by the same institution.
I cannot have the 2 databases on the same REDCap as 2 different projects because 1 set of data is owned by site 1 and the other one by site 2.
All I would like to achieve is to be able to have the record ID (in this case patient study ID) automatically transferred to site 2 REDCap to enable research data collection.
Currently we are entering the record ID twice, once in site 1 database and once again in site 2 database, which I'm not too keen on as this could easily incur typo, which would become a big issue at the end of the study once we want to match the clinical data with the research data.
I have never used API, but from my understanding it seems that could be the solution. I'm curious to know if this would be the best solution and would like to know if it would be easy to set up, or not.