> ## Documentation Index > Fetch the complete documentation index at: https://developers.criteo.com/llms.txt > Use this file to discover all available pages before exploring further. # Legacy & Universal Beacons > This page outlines Criteo's Legacy and the Universal beacon setups and explains how to migrate from Legacy to Standard/Universal beacons # Overview **Legacy v. Universal beacons** **Standard/Universalbeacons** offer a streamlined and efficient way to manage ad tracking by simplifying the beacon structure and reducing the number of requests sent, compared to **legacy beacons** which track each load at the individual product level. **Legacy beacons** differ from **standard or universal beacons** in how they handle tracking and data capture. While Standard/Universal beacons aggregate product-level data at the placement level, Legacy beacons send an additional `OnLoad` beacon for every single product, leading to different implementation and performance considerations. **Migrating from Legacy to Universal** We strongly recommend using Universal Beacons for new integrations. If you are already integrated with **Legacy beacons**, you can find [ in this section](/retailer-integration/docs/legacy-universal-beacons#migrating-from-legacy-to-universal-beacons) information on how to migrate to **Universal beacons**. *** # Key Differences ## Feature Comparison

Feature

Legacy beacons

Standard/Universal beacons

Data transmission

Sends an OnLoad beacon per product

Includes product data at the placement level

Performance impact

Higher network requests and load

More efficient, fewer requests

Implementation complexity

Requires per-product tagging

Consolidated tracking logic

Use case

Legacy setups requiring detailed per-product tracking

Modern implementations optimizing efficiency

Feedback mechanism

No feedback on missing products

Supports status codes for suppressed/not rendered products

Optimization potential

Limited visibility into why products didn't appear

Enables fill rate optimization and revenue improvement

**Legacy beacons** fire an `OnLoad` event for every product on the page. This means: * Each product gets a separate beacon request. * Increased network load due to multiple requests. * No feedback mechanism to indicate why certain products didn't make it onto the page, limiting optimization potential. *** ## Key Features of Universal Beacons 1. **Minimized response:** * Product-level `OnLoadBeacons` are removed, leaving just a single `OnLoadBeacon` at the placement level. This simplifies the overall tracking process. 2. **Reduced requests:** * By having a single `OnLoadBeacon` per placement, the total number of beacon requests is minimized, leading to less network traffic and improved performance. 3. **Feedback mechanism:** * Universal beacons include a feedback mechanism to report on why certain products were not rendered. * This allows for detailed reporting and better optimization of the overall fill rate - leading to more revenue. **Trigger the other beacons normally** While the Universal beacon simplifies the tracking process, it’s important to remember that other product-level beacons (such as `OnView`, `OnClick`, `OnBasketChange`, and `OnWishlist`) still need to be triggered as normal. These beacons ensure that specific interactions with individual product tiles are accurately tracked and reported. *** ## Examples ### Legacy Response Example Here is a sample response leveraging **Legacy beacons** with individual `OnLoad` events at the product level: ```json expandable theme={null} { "status": "OK", "placements": [ { "viewHome_API_desktop-Flagship": [ { "format": "FS", "products": [ { "ProductId": "16823", "ParentSKU": "16823", "OnLoadBeacon": "//b.us5.us.criteo.com/rm?rm_e=QsXdZsmn8ymw-ZAyoPB7JotDztSi_0h8ukCql_43BN14xQI0N4K965e1ZNo-tbt57lI78UI_MtKxer7GC5FeX08sJ1nUHXbjEIMA6_dUuO5PA-8RjllhHyX2KQfnsf75aMWwjiHRjwPLCxABBToVaBbkbLfowCECV59opCCaIQrc5YqrmzlX2PfC9vwEnI5kV8D8xAzQm7fpjaJQDx5boDFNxO_-F4iHw8Wn-hhWwNpk4A-f_v0CbonMh5Y6BdqlR17Ifya79Shdiwqqnkymbrafif72JStptOVo5cWhttQTw7EyQ8XVKaobUz6IwK1dxWrVdBNmrNcm8WYERKUpndEW160cdbECv9CRV2tXjiLPEDUW-2cGQlAfbSGJQGEzukBHzsRLVM0_iyZsalNJHg&ev=4", "OnViewBeacon": 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"//b.us5.us.criteo.com/rm?rm_e=sloVjDHD68JAycBoAJGWQyFIP0DqMYoAFJSP31JQMX-u2zibhPNIgYJyzM8jtfZSVWvTguYgX_L1liSpZKPDs5IFswQ65p8x6fY7r4SqOXke00gRuROKj9aEPXRTHLYyKUHX8giA0ensbt3KM-v4qMvJZoOKVBv2_27zEAhrPt4Zz6V0Y4kRTqJRaXXvSY5IyDvm2Vj-yGYY1-es5XNN_4K5rAXRYZZJn0n9nOwXe17MepTt5MXMqwrhot37Fcjbu5ww_HkGvFQMTTB3MCgEnEnMcyxYzHUV3nC0jJr5X42-8ny3baUynPFUnuKwSfzSGQL5_5PoOr5aIZnnzzbLCMbbzcn1AgLbSpsskwxnxdtt9-TZ1IUfCGQpWw4cB0Eb7Kax5CWgZbvYj1__gqZkJvwK47N_ebBHVS9XuqWNVVY&ev=4", "OnBundleBasketChangeBeacon": "//b.us5.us.criteo.com/rm?rm_e=6VUW1JJpcvC_2wJVOVs98zWwE58TE9NI_wWrdaOcnG6_HeWHFLog-1xP5F2v_zpXjCcrN6M7-PvXziHAb4BVZ5f7Tg7Rt-jhO7IkPhWVjrXE78djmHEhmgdUt9gFsFj4_4B_rYL5ZRa3QdlHns6BMntz39iElN0GnaTidmVd9aSWYM0Mw0DhT1DfvEisOsu4Dp87VFwJCRXqQB9J7tLlIEnf_m3KFvXdjImQ2x0yDUzAkVPwY_Ley-Vs3iSioioVl74xuW6rz9q2rDUCSC-B1TQETO3VmZd23H2BjrI5bF9IIShOiQG0SMtsYjHvFimInAJ9gmSbZLPi0QhopALOixXc79OJH7HbRv3DyF2ThXQX-A4F1dgXHjkk3IxY2fef803yG_Hdkbdw_UJ-rg__HQ&ev=4" } ] } ], "page-uid": "954ae0b4-c0c4-4898-9c18-bdd154eb9353" } ``` *** ### Universal Beacon #### Call example Here's an API call example using `curl`. Notice the `forceuniversal=1` parameter: ```bash theme={null} curl -X GET "https://d.us.criteo.com/delivery/retailmedia?criteo-partner-id=108341&retailer-visitor-id=456&customer-id=789&page-id=viewHome_API_desktop&event-type=viewHome&verbosity=min&forceuniversal=1" \ -H "Referer: https://www.criteo.com" \ -H "X-Forwarded-For: 123.456.789.012" \ -H "User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/91.0.4472.124 Safari/537.36" ``` *** #### Response example ```json expandable theme={null} { "status": "OK", "placements": [ { "viewCategory_API_desktop-InGrid": [ { "format": "sponsored_products", "products": [ { "ProductId": "18980", "ParentSKU": "18980", "OnLoadBeacon": "", "OnViewBeacon": "//b.us5.us.criteo.com/rm?rm_e=N-ShKii9k_Ssq07X2u05ueDtr86KFpQ_fGxGemRVh6ynpV--gKQpqQ5FXWm2jih5WL-bJVGa3yAsWPQVjU2j5fMqwDUfn1fdsUIoSDT5aKRthW6ML3ccNRI7cI2keo4TJgYLwuz51QkBM3s7Gf4hg0es63qyxhLUeWUwEF_rqySkHbAZPRg5wvmgzp8wzv7R-m4660kCeescoV-uFJDx_GzYou_DTSF6_UGzyx__SGbxr9eqRigYDK5mFvmfJsYIZrcmIjLjWRFzoD4ugdSv5JpubyCKzl-GBXVaP6Hfr7CkM4rG7p7LdJw5lFzMqARAt1INGfz5ZPcjuS2bDAvxdGsiJPtTAlXnTkUQs3wtKStMerGH5fCT27l38O5QVY5u4L2OPtiQpk3OqSK8Q3RTLixQDeLXlJpD8-Z96hZYYmUFI-O0TcfLNaaZr-0In_ewBqFK13lJ-CnXDlhTh7f6eg&ev=4", "OnClickBeacon": "//b.us5.us.criteo.com/rm?rm_e=A1-el1RLyd3kFjXa3kxK-mDkA47htch79hUhLlQaPmUSgbOXU6lLZ0DHwMY1Hl4_obWgi1d2vI5egrxczuXkfLngIppGvApAysqR8j6Dh_woNs2GQus0Ktazq10P_j0Lh1Ea24r7x3GQpobN_DU5j1yWZKT27-qC1MY6FlbUuz6FsGLmsx-1pqVWoMGaDmRpMw9RyaVeuRTGyYS162s74rVAFrUzucXTrnpZjNkteFFa_oqCTpd1YAh2dNnblhUsMHbrQ0qWd6JfF4Ojz5sZa5OsjZCEMDnwOxU-aCSpzvjvVmSdgt3EMuVY_P-KCP66v_Ug9_L8EIaUe8Bep-_o7fuHhPlFb7PeXFBC7mQLjXBZOATK8u0LzK9aqK6hpSXgWnwOnVWjeRlCX7r6la3Z1kZF5Es52ZE2cnZYtII6aZoQxiK4jzCZ6fooBtolurDqmS-RbUMLqxC304rmuueUhHOS4f7rlcr2oU_rnqaxhRw&ev=4", "OnBasketChangeBeacon": "//b.us5.us.criteo.com/rm?rm_e=G6d-bdVBQpa5bEP11vwqrODaP4mhmyTo-2uemQywvvI6JZF83Goi6-hMhjduPGEVaqceFsVZK8fPyHmXNx9ocWPBZHbWoFNldhYyac22vfs_5FJ0NhjHLq78ZcV2x6fTc5fZgQ73gMWGz6cpRFkZHMlB2IQLD3e-Td-Ho3YP3fUNNKQzM-yHc4RUcKsjZyQoncKScCDYr7jQe5OmPwl03gCu1XdUDMbz5-OB9APu-V8Y4lGza8rEF9Me--77mPi2NF0raPy-aI0mccj_tlJQtmJedxNGzPmf_kDDukbxYoU9sTT9SKOWEjdErAFQ2UVumUCoBv7s_BYjw8G2aNcU0mREFzTZwj9hq5vXb5ln4-0q-5sIuc-rb1MdaJjvIsF3Ci4omovDooeZ6Xqadoh0Q_Oc8gHlJNH9o2WXDXXxjskKjUQEvNC1c_TbI5s5xcNtyrG7WX80Dc3pVO9_Sd2hThATt2gLVHijo36dXFdMa-8&ev=4", "OnWishlistBeacon": "//b.us5.us.criteo.com/rm?rm_e=llE74E1HyOfUwQrToJb5mqlLadGyJnAK5HdkKyVKtWfEP3chiF9GFpgmecYRXOvQMSgXYkuTlmJ_CkjdH4nVDqPxwZbFsT8wMy5kFa7hEDjlrRN65xmQQqvuLw-BQRd53WPXUp2d8UaMBVHT6Km5ANS5iFGHQwtMkjlU5PoIpLnDWZOmaf2nH3Xu5ZIwa3nINGkENMF31_70elrw29z21ZoLcOY1AF2Gk7IkYU-SgB3AqPTwuIKKqpB8eHcvL3vCCzNElLi5tOVORBzYJall-YPHOpv1mdxo1aKQhPMthEez5uSGvA-TGEs0gTuF5KRPSAt1ZKO5oh920pdAY_05vQNGq3IpKWnoK-68OjeiISw8eX2EJlXeaIX2-TzMQx3yVK1NT3fngVwiBFTDzKjtMhfiUA8vyQI19HiEU8LjWyEUIuW_H4PvbzBvxJQzPYyjuNdtZD8CrmAOaU13tdQtRezHbr_khkWCWXdhrsF_BzE&ev=4" }, { "ProductId": "17942", "ParentSKU": "17942", "OnLoadBeacon": "", "OnViewBeacon": "//b.us5.us.criteo.com/rm?rm_e=fLTthwnThahZxZmquoRxO-4LQQQcFn6KKTt17T3aiS7iUbli5dwRpCcpaeY773cvWSkPywYkzUdnbQLSpiSMtmJtA9-UByhDcxIiVGprTEVXecfxibQ2t8tha_mD82PaP7bcWtEGhTIPB_7Sh4uMbRDsJvZXFkNDmeBUtYjYH1OayWORT19m1bK9xs7NOmhq8XWTYpV0eoySr197uJXr_tC1tTJsLpw9B1gdLJWE5eWYfvFyiALBOZb2SIzZW4Ebpj89NWCTQG1YWkBXZaLzeVWPTIG1T6xmPsm5ohEqZ1I7kMWrKlAc9pMIKLtm0QGTKPJG1JFuScRv79SF7fVIGCPMmD_HKWhoaVmOfhmvlKChqZIUaobEg-tnpRVlwJAjMv1vs4yQyfjdBPm9TWt353fZtgZC4O25iNEZVLodencliMRmN-bD1MqObqYBvV2ZU-94PxCF84kwSncvMLw4Kg&ev=4", "OnClickBeacon": "//b.us5.us.criteo.com/rm?rm_e=lI3GHpBoheOYxgnBViG67fpkTrw8kGQ7hm1tqpEI0GfPoq0ZXAaRa99aJTvj_wYLcl7-Ry8NuO5PMFiQXKFznTc6TeTTJ8SSHH_N7Je8CedTwns9XEoho5-LfcWaj3M2Zk1sC3G0a6R60QJJERbCp31okNm2g8818uOCqS7BV1cf75UgrumTVSQfUQhhnBQ6ESRGBFAcF5f5ZvNOaBnuZ0EtucRL8hbXAeD7kwjDK1ApsP0i3v9ypLC0QVHtLvs7MSCRr_g34wsv3agyKwvBHzOd7RICfF_D9tvuKQPb4h7PyunhUxxItZN14uXoEmWQV-ynFNqgCY9p5awKMAzsoW-b0DEsvj7iecSW0FyTwaAZwSbIq-Nt3YCVgNnAdYf8xX_4LsSH6jSJlpU6iloE7B1IkjQX3Gtg5-5HtzJaKjir1Aw9JFotkASjJtARNbLTSkN3J4tsrTzLRC6UeyTmPXo23E0ZoNW9F8ZFi8fNMho&ev=4", "OnBasketChangeBeacon": "//b.us5.us.criteo.com/rm?rm_e=v79SCFQ5rlZ06qfqbHTvHRI56ohUDws-T9P5N9apIOgcRdkrBziCUKcHiq5KkeOEuL-RQCLyHc-xAlzBraVbqAXbs7c46JlrafCN_15KruMeYcPR8bCje3K03ZUn5cv-lsAZ9_H4dWIMPyWUNgydktwDU25azhp-cjnZpuyI6ujH570_pG8EbDJ5SR6aqwDSN5yIvJABECIFVLjdoRP8_ytn2uOpvWScwIvxZ0au2lI99SZrnmIRGvZHjQ9FFCnhPbEwbK31faEddmznNhgUyYF8EaPf0-_-fYtnHr9UlY3sBkc48HPtMayh4HYI46AlXUvo0o-cNLmasf9MkdTL2ijVX1oAK52awmixwj9vaBk2OKnNWJZWB6091KlAZURFeMqIPOycFFGlJeIeKNEQfjyI751COVd58zhJn7GYs-3eeQ0457ZG2C1dbdYDKCtyEcDvSQCPk0kpwIDIct1iDz7ZHEz9O8a1u8pYrZPe8WY&ev=4", "OnWishlistBeacon": "//b.us5.us.criteo.com/rm?rm_e=Ax9-lQKiaVUcRjjo7M3cDjg_VrBsdnBp1bK7wjsbOK7K_rsibtceyPvPzjnEue7xan_ATFRNWKy8flZBD2m21LSTMHVJblmpC5IfnTdDXe8ZmJvwTSMfLvenm_ujIBX8xCWJQcaqVsKsdEEfrVizfWstwVTsOZQX1UAVd2HEYen4MOPuSE0G11GQrosJo-tzxmepOCZGiBpGUZAucoXXDZ_ZDqEm2ViZYLuK_962PqHLdJXSkXEDk4y_aQlefQ-FGPD916VqgWr9ei-l6I79ncLg7syeJvaDcN6cQT7qL3bc7Bfk3EWtt6aaavMBEm7oUHegZzA6_VLN602sxxoKvDoZWyclgFTPCaFjd7hPES0Z6NpFHT1hE57yfeTAJ_3-KkO55dJmnO_3XfnGqwZ0cBWAuTqyingLmvChHipXll1LqosFX0m8mLu4VZWqlNE9yWysFUb66vQbP0m7t9c5Iop6Potp32jgNshJYTxSvec&ev=4" } ], "rendering": "", "OnLoadBeacon": "//b.us5.us.criteo.com/rm?fid=1205&hl_qs_cmp=UuI4LMFkkrnpRE7z0TTT2aB3hglrxPB48XVDytIQlDZQLu7zkeGnv5Pm8-9K52-rZMkBTkaJIN38mgFfgl76hS3XO696Yui-e2tHR5cWRRsT1iXNoTTyFlJJLK6NDdOH2ePUCKu6gSfHVCFHrK6Ba2LAFqCeheNd7y40wNl-gDIsEE59q_YqQUxaFIxJOSWC6Lyj9fybBf4HWGuxS3bEuSuV4TXXkZQCiAi8suL3-Qo55_JVtrASEvhNxlw0JxlCYrx_thqBP-5x17jUH_NXKlUQeqGoDGaXRqSPKlM19u3dE8rd0M3Ba7BoPY-MjCegdw5kCmVRijvrH3531RPfvaEcIeEPsrOzNMwCA_l2chvHj-IheszCtRQdxWJ7sRyOLzf3y1nO3KrWMywSJJpcHx-Vf-AJc9S_g3Nk_UdkD8aE8PWnIgN8dlkJwo9Av-4JV0FnlwWNwAn2Ygi8xUIakcAYNlam4lsdamE-ewgLPQbjByEagJyeFQtjSg_h3YFAd9njdtkziKNrtmYaigCVpKbzTp34NWWN_Zap-nKsC1lQY2_LlZkpMq0Qq0npF7xc&ev=4&criteopartnerid=108341&nolog=1&action=universal&origc=A&pid=0c3bf1f4-0c32-4efd-8373-1a2c86e08c8d&rn=1455740606&u=1&rm_e=pgzSPvrz-PTX8wOho1D1Q7_zwuTI_ReutLMUwY4-l47Mg_FiEPUZ_Cr_W4tzu7wm3s5zBFHpufuvfUJoPhiipBZPSsbFuLRGG29IjBQ8X8KGdGXPvJAsLK3r8LcmIKibowD8NG90b7BvoRq0LAAo7q0lYUKnAaE7npmoUaT-VWE6_VKwDqMmQn5KLdyxnnmUs4IB5AQpHrdniJyojUYXFVzDillJ0LlCEo1Xxls6aWBYojCMAuJCtfrcnTMcXRwjTy9pCwZa5TqGCZfEz1asOjQ19zodBr5kylGDDkg9zrgUSHVwy62nIryQl2CbU-4PyTqRcmdz9OR8KLkPrW6Y5Kfwqm7LblMB8eHX-swUb8i_IJf-iFZPZlQFvI9gU5oe", "OnViewBeacon": "//b.us5.us.criteo.com/rm?rm_e=nWCQ1D0YYYhNJ8RFe0gsAZTX1U0Hj8qndrHlfVeZe4BbiY1IQAoQI0xfYPOGW1DT9KUN2gqqO_9jIXgOG0k1y7vn835cr7HP59D0jWg6_ZkgmUUehUA0ejDIGIXSps-Bi5wBnXv7BCKyk8_Soi3Lze4_qg1cwE3wq-2w5VPbeI64peSegx-l-RGNDRdCMTYxk3pl459LIHV4gQtd2jSf5SZQSkFfEPnhZTJjAdd5U0wF7JRDgAUC79-cobFO4IgJJMmB8PlG9iQzYJHHWZ9erWhHqG5O3ISpk3yermUywv4OTwxcKWTCJY3skBtdOxZo2BH9B0wYW3abEGNXNPBlLCnyHdDcEGCYeXRk1gWy5BnqtFY7xK8kVP_5-v_6OqankRl5JCDI__Z2JEmB-Nrq_Q&ev=4", "OnClickBeacon": "" } ] } ], "page-uid": "b24d9dea-aa9e-4c3c-a203-9d7f72c3db1c" } ``` *** ### Notes on the Response * **`OnLoadBeacons`at the product level are empty:** * Notice that the `OnLoadBeacon` for each product is empty. This is expected as there is only one `OnLoadBeacon` at the placement level when leveraging universal beacons. * **Single`OnLoadBeacon` per placement** * The `OnLoadBeacon` at the placement level contains all the necessary information, significantly reducing the number of beacons sent. * **Action parameter** * The `OnLoadBeacon` at the placement level includes the parameter `action=universal`, indicating that the response is using universal beacons. *** ### Handling non-rendered Products For SKUs that were not rendered, you must append additional parameters to the universal `OnLoadBeacon`to avoid inaccurate impression and attribution counts. Here’s how to handle unrendered products: 1. **Specify unrendered SKUs:** Use the `ex` parameter to list the SKUs that were not rendered. 2. **Add exclusion reasons:** Use the `st` parameter to specify the reasons for each unrendered SKU. #### Example ```html theme={null} "//b.us5.us.criteo.com/rm?fid=1205&hl_qs_cmp=UuI4LMFk...&action=universal&ex=17942|18980&st=3|302" ``` #### Status codes Please refer to [this page](/retailer-integration/docs/beacon-types#non-rendered-product-status-codes) for a full list of status codes. *** # Migrating from Legacy to Universal beacons To migrate from **Legacy beacons** to **Universal beacons**, you will need to coordinate with your Technical Account Manager (TAM). Here’s how you can make the transition: 1. **Enable the`forceuniversal` parameter in pre-production**\ Add the parameter `&forceuniversal=1` to all API calls in your pre-production environment. 2. **QA**\ Collaborate with your TAM to test the new beacon logic in the pre-production environment to ensure it functions correctly. 3. **Deploy to production**\ Once the QA phase is successful, release the new logic into the production environment with the `&forceuniversal=1` parameter included in all API calls. 4. **Internal update**\ Criteo will update your internal configuration to automatically send universal beacons in your ad responses, eliminating the need for the `&forceuniversal=1` parameter. 5. **Parameter removal**\ You can then remove the `&forceuniversal=1` parameter from your API calls at your convenience. ***
## What's next * [BeaconSDK](/retailer-integration/docs/beacon-sdk) * [Server-Side Beacons](/retailer-integration/docs/server-side-beacons) * [Ad Tracking Best Practices](/retailer-integration/docs/ad-tracking-best-practices)