See moreA US judge early Sunday blocked the Trump administration from requiring Apple Inc and Alphabet Inc’s Google to remove Chinese-owned messaging app WeChat for downloads by late Sunday. Liveperson Inc. increased II. LivePerson is running a key webinar to help industry brands rapidly scale care and commerce operations through Conversational AI and messaging in the post-pandemic travel resurgence. Average revenue per customer was $570,000, up 34% year-over-year, driven primarily by continued expansion from care to commerce, which translates to increased platform usage for both our CPI and Gainshare business models. For example, volume for our top 20 brands increased 25% year-over-year and 175% over the third quarter of 2019. With the majority of our top 20 now on CPI or Gainshare pricing models, we are benefiting from a tighter connection between usage and revenue. In terms of usage and revenue trends by vertical, we continue to see significant growth within retail financial services and increasingly healthcare. In terms of market dynamics, while brand broadly migrating to cloud offerings, the motion is complicated by legacy infrastructure and compliance as well as high switching costs. On the latter point, note that we expect to ramp costs faster than revenue in the initial phase of a new contract or existing customer expansion due to the need for infrastructure integration and agent training.
Note that we will provide additional financial details and 2022 guidance on our fourth quarter filings. In terms of guidance, with the third quarter results landing in the upper end of our range and solid execution on our strategy, we are raising 2021 revenue guidance to a range of $468 million to $471 million or 27.7% year-over-year to 28.5% year-over-year. Note that international growth was impacted by hard comparables in the third quarter of 2020 upsells that rolled overage volume into 12 months plus contract periods and a large delayed deal in EMEA that we expect to close this month. Note that these revenue sources, namely AI-assisted healthcare testing, professional services and Gainshare tend to exert pressure on gross margins. Over time, accelerating rates of automation have proven to expand margins. Once again, the go-to-market investments we made in the third quarter, which will continue into 2022 are laying the foundation for materially accelerating new logo acquisition. In the third quarter, total revenue grew $118.3 million, up approximately 25% year-over-year and within the top half of our guidance range. In terms of progress on our go-to-market investments, we ended the third quarter with 96 quota carriers.
As for the balance sheet and cash flow highlights, we closed the quarter with $633 million of cash and cash equivalents, a decrease of $32 million from the second quarter, which was driven by the use of cash for planned investments and the e-bot seven transaction. While we were in line with our expectations for the third quarter, we expect slight but continued margin compression for the full year, driven primarily by continued COVID-19 testing and front-loaded investments across our Gainshare portfolio. While you’re taking the test, you can easily glance over to your right to see how much time you have left, your typing speed, and the number of errors. Customer-focused. The live chat must put customer satisfaction at the forefront by providing a swift response time and reliable live chat uptime. You must have felt surprised at how Amazon e-commerce app knows what you would like based on your frequent page visits, cart items selection and social sharing.
But there was a renewed interest in chatbots at Apple’s Worldwide Developers Conference in 2017 when the company introduced Apple Business Chat, a platform designed to exist within the Messenger app that lets businesses interact with consumers via a mixture of bots and humans. Revenue from our Business segment accounted for 90% and 88% of total revenue for the three months ended March 31, 2012 and 2011, respectively. We have also seen significant growth from large existing accounts over the past 24 months. Herzing neither represents that its graduates will earn the average salaries calculated by BLS for a particular job nor guarantees that graduation from its program will result in a job, promotion, salary increase or other career growth. Guayadeque is a music management program designed for all music enthusiasts. The platform is designed around the unified communications concept which means that it packs GoToMeeting software for management of virtual meetings with Jive’s full-blooded business phone service. Our future success depends to a significant extent on the continued services of our senior management team. Sure. Yes, the e-bot7 team is a really talented and innovative team that extends our go-to-market capabilities in the region. Adjusted EBITDA in the third quarter was $6.9 million or 5.8% margin, which reflects the sizable go-to-market investments we made during the quarter.