HealthConnected has been supplying `bsn` via header instead of param and expect that to work

paths/patient_base.yaml

@@ -8,7 +8,16 @@ get:
       in: query
       description: |-
         The SSN (dutch: _BSN_) of a patient to look up. May only contain digits, cannot contain more than 9 digits, and cannot be 0.
-      required: true
+      schema:
+        type: integer
+        format: int32
+        minimum: 1
+        maximum: 999999999
+        example: 123456789
+    - name: bsn
+      in: header
+      description: |-
+        An alternate location for the `bsn` parameter.
       schema:
         type: integer
         format: int32

paths/patient_dossier.yaml

@@ -18,7 +18,17 @@ get:
       in: query
       description: |-
         The SSN (dutch: _BSN_) of a patient to look up. May only contain digits, cannot contain more than 9 digits, and cannot be 0.
-        Either `bsn` or `pu` must be present.
+        Either `bsn` or `pu` must be present. Note that `bsn` can also be sent via header (not recommended).
+      schema:
+        type: integer
+        format: int32
+        minimum: 1
+        maximum: 999999999
+        example: 123456789
+    - name: bsn
+      in: header
+      description: |-
+        An alternate location for the `bsn` parameter.
       schema:
         type: integer
         format: int32