Why does GB in-app subscription results in 12.17% tax_percentage (VAT) from webhook?

Hi,

We’re seeing events from the Revenue Cat webhook whilst in Sandbox mode (before go-live) where a subscription or renewal flows through with 12.17% `tax_percentage`. Can anyone explain why that might be? I would expect 20% VAT? Is it something we’ve misconfigured or am I missing something?

Example webhook event here:

1{
2  "api_version": "1.0",
3  "event": {
4    "aliases": [
5      "9e2090e4-11cc-4ff8-8f0f-281eb9e6b84d",
6      "$RCAnonymousID:7610af8f52924950b428cd4d313823f2"
7    ],
8    "app_id": "app790cf74d0c",
9    "app_user_id": "9e2090e4-11cc-4ff8-8f0f-281eb9e6b84d",
10    "commission_percentage": 0.3,
11    "country_code": "GB",
12    "currency": "GBP",
13    "entitlement_id": null,
14    "entitlement_ids": [
15      "Pro"
16    ],
17    "environment": "SANDBOX",
18    "event_timestamp_ms": 1678382003118,
19    "expiration_at_ms": 1678382162000,
20    "id": "6D453662-6B23-47EE-97B4-7856431CA391",
21    "is_family_share": false,
22    "is_trial_conversion": false,
23    "offer_code": null,
24    "original_app_user_id": "$RCAnonymousID:7610af8f52924950b428cd4d313823f2",
25    "original_transaction_id": "2000000253163431",
26    "period_type": "NORMAL",
27    "presented_offering_id": "default",
28    "price": 11.837,
29    "price_in_purchased_currency": 9.99,
30    "product_id": "oscil8_umg_staging_1month",
31    "purchased_at_ms": 1678381862000,
32    "store": "APP_STORE",
33    "subscriber_attributes": {
34      "$attConsentStatus": {
35        "updated_at_ms": 1674161971463,
36        "value": "restricted"
37      }
38    },
39    "takehome_percentage": 0.7,
40    "tax_percentage": 0.1217,
41    "transaction_id": "2000000293715660",
42    "type": "RENEWAL"
43  }
44}

Thanks,

Dan