update docs

docs/bmlapi/13-qr-payment.md

@@ -43,7 +43,7 @@ PayMV QRs (static, PayMV-native) use a decimal TLV encoding (not BER-TLV):
 <2-digit decimal tag><2-digit decimal length><value>...
 ```
 
-### Root-level tags
+### Root-level tags (key fields for scanning)
 
 | Tag | Field |
 |---|---|
@@ -59,6 +59,8 @@ PayMV QRs (static, PayMV-native) use a decimal TLV encoding (not BER-TLV):
 | `26` | `03` | Account number |
 | `62` | `08` | Payment purpose / reference |
 
+> For the full PayMV QR format spec including generation (receive-payment QRs), acquirer BIC mapping, CRC algorithm, and all tags — see [PayMV QR Format](../thijooree/18-paymv-qr-format.md).
+
 ---
 
 ## Step 1 — Resolve QR to Merchant Details