[FIX] rate calculation when creating using crypto amount instead of usd

src/store/shop/shop.models.ts

@@ -178,6 +178,7 @@ export interface Invoice {
       threshold: number;
     };
   };
+  usdAmount: number;
 }
 
 export interface PhoneCountryInfo {

src/store/wallet/effects/send/send.ts

@@ -354,15 +354,31 @@ export const getNonce = (
 };
 
 export const getInvoiceEffectiveRate =
-  (invoice: Invoice, coin: string, chain: string): Effect<number | undefined> =>
+  (
+    invoice: Invoice,
+    defaultAltCurrencyIsoCode: string,
+    coin: string,
+    chain: string,
+  ): Effect<number | undefined> =>
   dispatch => {
     const precision = dispatch(GetPrecision(coin, chain));
+    if (!precision) {
+      return undefined;
+    }
+
     const invoiceCurrency = getCurrencyCodeFromCoinAndChain(coin, chain);
-    return (
-      precision &&
-      invoice.price /
-        (invoice.paymentSubtotals[invoiceCurrency] / precision.unitToSatoshi)
-    );
+    const toUnit =
+      invoice.paymentSubtotals[invoiceCurrency] / precision.unitToSatoshi;
+
+    if (defaultAltCurrencyIsoCode === 'USD') {
+      return invoice.usdAmount / toUnit;
+    }
+
+    if (defaultAltCurrencyIsoCode === invoice.currency) {
+      return invoice.price / toUnit;
+    }
+
+    return undefined;
   };
 
 /*
@@ -445,11 +461,17 @@ export const buildTxDetails =
     }
 
     amount = Number(amount); // Support BN (use number instead string only for view)
-    const effectiveRate =
-      (invoice &&
-        invoiceCurrency &&
-        dispatch(getInvoiceEffectiveRate(invoice, invoiceCurrency, chain))) ||
-      undefined;
+    let effectiveRate;
+    if (invoice && invoiceCurrency) {
+      effectiveRate = dispatch(
+        getInvoiceEffectiveRate(
+          invoice,
+          defaultAltCurrencyIsoCode,
+          invoiceCurrency,
+          chain,
+        ),
+      );
+    }
     const opts = {
       effectiveRate,
       defaultAltCurrencyIsoCode,