chore(docs): Generated API reference (#2788)

docs/api/admin/code_samples/JavaScript/payments_{id}/getundefined

@@ -0,0 +1,7 @@
+import Medusa from "@medusajs/medusa-js"
+const medusa = new Medusa({ baseUrl: MEDUSA_BACKEND_URL, maxRetries: 3 })
+// must be previously logged in or use api token
+medusa.admin.payments.retrieve(payment_id)
+.then(({ payment }) => {
+  console.log(payment.id);
+});