Added branches support for entry variant and variant group

Author: cs-raj

packages/contentstack-variants/src/export/experiences.ts

@@ -16,7 +16,10 @@ export default class ExportExperiences extends PersonalizationAdapter<ExportConf
       headers: { 'X-Project-Uid': exportConfig.project_id },
       cmaConfig: {
         baseURL: exportConfig.region.cma + `/v3`,
-        headers: { api_key: exportConfig.apiKey },
+        headers: {
+          api_key: exportConfig.apiKey,
+          ...(exportConfig.branchName ? { branch: exportConfig.branchName } : {}),
+        },
       },
     });
     this.exportConfig = exportConfig;

packages/contentstack-variants/src/import/experiences.ts

@@ -50,7 +50,10 @@ export default class Experiences extends PersonalizationAdapter<ImportConfig> {
       headers: { 'X-Project-Uid': config.modules.personalize.project_id },
       cmaConfig: {
         baseURL: config.region.cma + `/v3`,
-        headers: { api_key: config.apiKey },
+        headers: {
+          api_key: config.apiKey,
+          ...(config.branchName ? { branch: config.branchName } : {}),
+        },
       },
     };
     super(Object.assign(config, conf));

packages/contentstack-variants/src/utils/personalization-api-adapter.ts

@@ -155,6 +155,17 @@ export class PersonalizationAdapter<T> extends AdapterHelper<T, HttpClient> impl
           this.cmaAPIClient?.headers({ authtoken: token });
         }
       }
+
+      // Ensure the CMA client targets the configured branch. Variant groups, CT
+      // links and other stack-CMA endpoints are branch-scoped, so without this
+      // header the requests would fall back to the default (main) branch even
+      // when the import/export is running against a non-main branch.
+      const branchName = (this.config as any)?.branchName;
+      if (this.adapterConfig.cmaConfig && branchName) {
+        log.debug(`Setting branch header for CMA client: ${branchName}`, this.exportConfig?.context);
+        this.cmaAPIClient?.headers({ branch: branchName });
+      }
+
       log.debug('Personalization adapter initialization completed', this.exportConfig?.context);
     } catch (error: any) {
       log.debug(`Personalization adapter initialization failed: ${error}`, this.exportConfig?.context);