I am about to begin working on an API between SFDC(CRM) and KIPU(EMR) 
KIPU's API only allows for POST and GET, so everything I do will need to be within Salesforce.
I want all client information to POST to a new file in KIPU when stage changes to Admit. Thats fine and dandy, but I want to have custom fields/stages in SF update when the client admits and discharges in KIPU.
What would be the best way to go about automating GET from Kipu.
*side note* it could be weeks in between when a client admits and discharges.

Thank You