fix wpcfto select and repeater related visibility and validation

readme.txt

@@ -76,4 +76,41 @@ Developed by Dwindi Ramadhana.
 
 == Privacy ==
 
-Formipay collects and processes user data in accordance with GDPR. Please review and customize the included privacy policy template for your site.
+Formipay collects and processes user data in accordance with GDPR. Please review and customize the included privacy policy template for your site.
+
+== Mermaid Multi-Currency Implementation ==
+
+flowchart TD
+  GS[Global Settings]
+  GS -->|Toggle: Multi‑Currency ON/OFF| MODE{Mode}
+
+  %% SINGLE-CURRENCY MODE
+  MODE -->|OFF| SC[Single‑Currency Mode]
+  SC -->|GS Default Currency only| FS1[Form Settings]
+  SC -->|GS Default Currency only| PS1[Product Settings]
+  FS1 --> CO1[Checkout]
+  PS1 --> CO1
+  CO1 --> ORD1[Order Stored :: currency = GS default]
+  ORD1 --> RPT1[Reports for single currency]
+
+  %% MULTI-CURRENCY MODE
+  MODE -->|ON| MC[Multi‑Currency Mode]
+  GS -->|Enabled Currencies + Rates| FS[Form Settings]
+  GS -->|Enabled Currencies + Rates| PS[Product Settings xN]
+
+  FS -->|FS.allowed ⊆ GS.enabled\nFS.default ∈ FS.allowed| CK[Checkout]
+  PS -->|Per Product:\nBase currency default GS\nManual overrides optional\nDerive from base via GS toggle| CK
+
+  CK -->|Compute CheckoutAllowed =\nFS.allowed ∩ as ProductSupported p| ALLOWED{CheckoutAllowed empty?}
+  ALLOWED -->|Yes| BLOCK[Block checkout + Admin diagnostic:\nEnable derive / add manual prices /\nadjust FS.allowed / remove product]
+  ALLOWED -->|No| CUR[Buyer selects currency ∈ CheckoutAllowed]
+
+  CUR --> PAY[Filter payment gateways by selected currency]
+  PAY --> TOT[Compute totals:\nManual price → else derive via GS]
+  TOT --> ORD[Persist Order:\norder_currency, total_in_order_currency,\nfx_rate_used, report_total_in_GS_base]
+  ORD --> RPT[Reports:\nSum in GS base with per‑currency breakdown option]
+
+  %% CATALOG (when MC=ON)
+  MC --> CAT[Catalog]
+  CAT -->|Query: currency=USD,IDR,AUTO| RESOLVE[Resolve display currency AUTO→pref/GS default]
+  RESOLVE --> FILT[Filter products strictly:\nshow only products supporting the display currency\n derive ok if product toggle is ON]