[NDR-270] Update apim url (#479)

Author: megan-bower4

infrastructure/variable.tf

@@ -243,7 +243,7 @@ locals {
   current_region     = data.aws_region.current.name
   current_account_id = data.aws_caller_identity.current.account_id
 
-  apim_api_url = "https://${var.apim_environment}api.service.nhs.uk/national-document-repository"
+  apim_api_url = "https://${var.apim_environment}api.service.nhs.uk/national-document-repository/FHIR/R4"
 
   truststore_bucket_id = local.is_sandbox ? "ndr-dev-${var.truststore_bucket_name}" : module.ndr-truststore[0].bucket_id
   truststore_uri       = "s3://${local.truststore_bucket_id}/${var.ca_pem_filename}"