Make sure every vendor you owe exists in Business Central

**Objective:** Confirm that Dynamics GP vendors were migrated to Business Central with matching master data, for vendor `{vendor-id}` or, if that is empty, every active GP vendor.

**Step 1: Read the GP vendors**

Call `dynamics-gp-get-pm-vendor`, with `vendor-id` set to `{vendor-id}` when it is given. Use a `max-records` large enough for the whole vendor list (for example 5000), and leave out vendors whose vendor-status is Inactive or Temporary. If exactly `max-records` rows come back, say the list may be truncated.

**Step 2: Read the BC vendors**

Call `business-central-get-vendor`, with `vendor-number` set to `{vendor-id}` when it is given, otherwise for the full list.

Match GP `vendor-id` to BC `vendor-number`, trimmed and case-insensitive.

**Step 3: Compare each matched pair**

* vendor-name vs name
* payment-terms-id vs payment-terms-code
* hold = true in GP vs a non-blank blocked value in BC
* vendor-contact vs contact
* city and state
* primary-email-address vs email
* phone-number-1 vs phone-number, comparing digits only

**Step 4: Report**

Start with counts: matched with no differences, matched with differences, in GP but missing from BC, in BC with no GP match. Then a table of the differences (vendor, field, GP value, BC value). List the missing vendors separately, with each one's GP current-balance, because a missing vendor with an open balance is a blocker for the payables cutover. List the BC-only vendors last as probably created after go-live.

**Rules & Guidelines:**

* `dynamics-gp-get-pm-vendor` is on the dynamics-gp server. `business-central-get-vendor` is on the business-central server.
* This prompt is read-only. Do NOT call `business-central-create-vendor`, `business-central-update-vendor`, `dynamics-gp-pm-vendor-add` or `dynamics-gp-pm-vendor-update`.
* If either system has more than one company, ask the user which GP company and which BC company to use before the first call, and pass them as `company`.

**Validation:**

* If GP returns no vendors, stop and ask the user to confirm the GP company. If BC returns none, report that the vendor migration has not run yet.
* When a whole set of vendors differs the same way on payment terms, report the pairing once as a mapping.
* Treat a difference in case or surrounding spaces only as a match.