$validate-code Example 2: Invalid Code GET https://fhir.qa.aws.openconceptlab.org/orgs/PEPFAR-Test10/ValueSet/$validate-code/?url=https://datim.org/ValueSet/MER-R-FACILITY-BASED-FY2020Q4&system=https://datim.org/CodeSystem/MER&code=XboLlTkc4Av&systemVersion=HEAD Request Params KeyDatatypeRequiredDescriptionurlstringsystemstringcodestringsystemVersionstring