CCM-15623 - BillingId should be optional

Author: nhsd-david-wass

internal/datastore/src/types.ts

@@ -54,7 +54,7 @@ export const LetterSchema = LetterSchemaBase.extend({
   source: z.string(),
   subject: z.string(),
   billingRef: z.string(),
-  specificationBillingId: z.string(),
+  specificationBillingId: z.string().optional(),
 }).describe("Letter");
 
 /**

internal/events/src/domain/letter.ts

@@ -83,7 +83,10 @@ The identifier will be included as the origin domain in the subject of any corre
       examples: ["1y3q9v1zzzz"],
     }),
 
-    specificationBillingId: z.string().meta({
+    specificationBillingId: z
+      .string()
+      .optional()
+      .meta({
       title: "Specification Billing ID",
       description:
         "The billing ID from the letter specification which was used to produce a letter pack for this request.",