bidderSettings: Allow Currency Code control through adjustCurrency

src/auction.js

@@ -117,6 +117,13 @@ const queuedCalls = [];
 
 const pbjsInstance = getGlobal();
 
+/**
+ * Get Prebid config options
+ * @param {Object} options
+ * @alias module:pbjs.getConfig
+ */
+pbjsInstance.getConfig = config.getAnyConfig;
+
 /**
  * Clear global state for tests
  */
@@ -912,6 +919,11 @@ export function adjustBids(bid) {
 
   if (bidPriceAdjusted >= 0) {
     bid.cpm = bidPriceAdjusted;
+    // Get the currency adjust setting for this bidder
+    const shouldAdjustCurrency = bidderSettings.getCurrencyAdjust(bid.bidderCode);
+    if (shouldAdjustCurrency === true) {
+      bid.currency = config.getConfig('currency')?.adServerCurrency;
+    }
   }
 }
 

src/bidderSettings.js

@@ -8,6 +8,22 @@ export class ScopedSettings {
     this.defaultScope = defaultScope;
   }
 
+  // To validate currency settings
+  validateCurrencyAdjust(value) {
+    return value === undefined || typeof value === 'boolean';
+  }
+
+  // Currency Adjust Method
+  getCurrencyAdjust(bidderCode) {
+    // For bidder specific
+    let currencyAdjust = this.get(bidderCode, JSON_MAPPING.CURRENCY_ADJUST);
+    // For standard
+    if (typeof currencyAdjust === 'undefined') {
+      currencyAdjust = this.get(this.defaultScope, JSON_MAPPING.CURRENCY_ADJUST);
+    }
+    return currencyAdjust;
+  }
+
   /**
    * Get setting value at `path` under the given scope, falling back to the default scope if needed.
    * If `scope` is `null`, get the setting's default value.

src/constants.js

@@ -6,7 +6,8 @@ export const JSON_MAPPING = {
   BD_ID: 'paramsd',
   BD_PL_ID: 'placementId',
   ADSERVER_TARGETING: 'adserverTargeting',
-  BD_SETTING_STANDARD: 'standard'
+  BD_SETTING_STANDARD: 'standard',
+  CURRENCY_ADJUST: 'adjustCurrency'
 };
 
 export const DEBUG_MODE = 'pbjs_debug';

test/spec/unit/core/bidderSettings_currency_spec.js

@@ -0,0 +1,92 @@
+// test/spec/bidderSettings_currency_spec.js
+import { JSON_MAPPING } from '../../../../src/constants.js';
+import { expect } from 'chai/index.js';
+import {bidderSettings} from '../../../../src/bidderSettings.js';
+import {config} from '../../../../src/config.js';
+import { getGlobal } from '../../../../src/prebidGlobal';
+import { adjustBids } from '../../../../src/auction.js';
+
+describe('Bidder Settings Currency Adjustment', function() {
+  let bid;
+  let sandbox;
+
+  beforeEach(function() {
+    bid = {
+      bidderCode: 'appnexus',
+      cpm: 1.5,
+      currency: 'USD'
+    };
+
+    // Reset pbjs global object
+    window.pbjs = getGlobal();
+    window.pbjs.bidderSettings = {};
+
+    // Set default currency config
+    config.setConfig({
+      currency: {
+        adServerCurrency: 'EUR'
+      }
+    });
+  });
+
+  afterEach(function() {
+    config.resetConfig();
+  });
+
+  describe('currency adjustment setting', function() {
+    it('should respect bidder-specific currency adjustment setting', function() {
+      // Setup
+      window.pbjs.bidderSettings = {
+        appnexus: {
+          [JSON_MAPPING.CURRENCY_ADJUST]: true
+        }
+      };
+
+      // Execute
+      adjustBids(bid);
+
+      // Assert
+      expect(bid.currency).to.equal('EUR');
+    });
+
+    it('should use standard setting when bidder-specific not defined', function() {
+      // Setup
+      window.pbjs.bidderSettings = {
+        standard: {
+          [JSON_MAPPING.CURRENCY_ADJUST]: true
+        }
+      };
+
+      // Execute
+      adjustBids(bid);
+
+      // Assert
+      expect(bid.currency).to.equal('EUR');
+    });
+
+    it('should not adjust currency when setting is false', function() {
+      // Setup
+      window.pbjs.bidderSettings = {
+        appnexus: {
+          [JSON_MAPPING.CURRENCY_ADJUST]: false
+        }
+      };
+
+      // Execute
+      adjustBids(bid);
+
+      // Assert
+      expect(bid.currency).to.equal('USD');
+    });
+
+    it('should not adjust currency when setting is undefined', function() {
+      // Setup - no settings defined
+
+      // Execute
+      adjustBids(bid);
+
+      // Assert
+      expect(bid.currency).to.equal('USD');
+    });
+  });
+});