[PGE-178206904] Send Transaction ID to STX

`source.tid` is transaction id at the request level
`bidReq.ortb2Imp` may carry a transaction id at the impression level (`imp.ext.tid`)

Followed recommendations provided by contributors here: prebid#8573

PGE-178206904

modules/sharethroughBidAdapter.js

@@ -1,4 +1,4 @@
-import { deepAccess, generateUUID, inIframe } from '../src/utils.js';
+import { deepAccess, generateUUID, inIframe, mergeDeep } from '../src/utils.js';
 import { registerBidder } from '../src/adapters/bidderFactory.js';
 import { config } from '../src/config.js';
 import { BANNER, VIDEO } from '../src/mediaTypes.js';
@@ -52,6 +52,7 @@ export const sharethroughAdapterSpec = {
         ext: {},
       },
       source: {
+        tid: bidderRequest.auctionId,
         ext: {
           version: '$prebid.version$',
           str: VERSION,
@@ -80,12 +81,12 @@ export const sharethroughAdapterSpec = {
     }
 
     const imps = bidRequests.map(bidReq => {
-      const impression = {};
+      const impression = { ext: {} };
+
+      mergeDeep(impression, bidReq.ortb2Imp);
 
       const gpid = deepAccess(bidReq, 'ortb2Imp.ext.data.pbadslot');
-      if (gpid) {
-        impression.ext = { gpid: gpid };
-      }
+      if (gpid) impression.ext.gpid = gpid;
 
       const videoRequest = deepAccess(bidReq, 'mediaTypes.video');
 

test/spec/modules/sharethroughBidAdapter_spec.js

@@ -85,6 +85,7 @@ describe('sharethrough adapter spec', function () {
           },
           ortb2Imp: {
             ext: {
+              tid: 'transaction-id-1',
               data: {
                 pbadslot: 'universal-id',
               },
@@ -168,6 +169,7 @@ describe('sharethrough adapter spec', function () {
         refererInfo: {
           ref: 'https://referer.com',
         },
+        auctionId: 'transactionId1',
       };
     });
 
@@ -229,6 +231,7 @@ describe('sharethrough adapter spec', function () {
             expect(openRtbReq.device.ua).to.equal(navigator.userAgent);
             expect(openRtbReq.regs.coppa).to.equal(1);
 
+            expect(openRtbReq.source.tid).to.equal(bidderRequest.auctionId);
             expect(openRtbReq.source.ext.version).not.to.be.undefined;
             expect(openRtbReq.source.ext.str).not.to.be.undefined;
             expect(openRtbReq.source.ext.schain).to.deep.equal(bidRequests[0].schain);
@@ -310,12 +313,21 @@ describe('sharethrough adapter spec', function () {
         });
       });
 
+      describe('transaction id at the impression level', () => {
+        it('should include transaction id when provided', () => {
+          const requests = spec.buildRequests(bidRequests, bidderRequest);
+
+          expect(requests[0].data.imp[0].ext.tid).to.equal('transaction-id-1');
+          expect(requests[1].data.imp[0].ext).to.be.empty;
+        });
+      });
+
       describe('universal id', () => {
         it('should include gpid when universal id is provided', () => {
           const requests = spec.buildRequests(bidRequests, bidderRequest);
 
           expect(requests[0].data.imp[0].ext.gpid).to.equal('universal-id');
-          expect(requests[1].data.imp[0].ext).to.be.undefined;
+          expect(requests[1].data.imp[0].ext).to.be.empty;
         });
       });