Thanks, Andrew. Q3 was another outstanding quarter for Klaviyo. Demand is strong across every growth engine. AI is amplifying our impact, and we are driving innovation for our customers as the definitive CRM for B2C businesses. Revenue grew 32% year-over-year to $311 million, reflecting robust demand from new customers and continued multiproduct expansion from our existing ones. International revenue growth accelerated for the sixth straight quarter. We had record net adds into our $50,000-plus customer cohort. NRR accelerated to 109% and adoption of our new service product is already outpacing what we saw from SMS at this same stage just 6 weeks after launch. The results are clear. Our growth engines are delivering and AI is a force multiplier. We're investing for high growth while maintaining strong unit economics. Non-GAAP operating margin this quarter was 14.5%, meaning our Rule of 40 performance was nearly 47%, our highest in 4 quarters. There are fewer than 10 public software companies who are growing more than 30%, over $1 billion in revenue run rate and achieving the Rule of 40. We're proud to be among that top-performing group. At our Investor Day, we outlined 3 engines driving Klaviyo's long-term growth: multiproduct expansion, international acceleration and mid-market and enterprise momentum, all fueled by AI, which creates tailwinds for our business and positions Klaviyo to be the platform of choice for brands everywhere. In Q3, each of these engines delivered meaningful progress, which underscores the power of our model. Starting with our multiproduct platform. The foundation of our growth is our large and growing customer base. In the third quarter, we added 7,000 new customers, bringing us to more than 183,000 customers, up 17% year-over-year. Companies are choosing Klaviyo as their B2C CRM because we help them grow their businesses by unifying their customer data, marketing, service and analytics applications and now by bringing Agentic AI into that same connected platform. And as we drive success for our customers, they in turn are growing their business with us. NRR rose to 109% in the third quarter, driven by e-mail expansion, strong text messaging cross-sell and momentum from newer products, including marketing analytics. At Klaviyo Boston in September, we accelerated innovation across the platform. In addition to the marketing and customer agents Andrew talked about, we enhanced Klaviyo marketing with new omnichannel capabilities and new channels, including WhatsApp. We also released to general availability our new product line, Klaviyo Service with Customer Hub, customer agent and help desk. Our product velocity is accelerating, thanks in part to internal AI efforts, and we're now deploying product updates 270 times a day and have over 50 AI models in production that are predicting customer behavior, surfacing insights and marketing analytics and helping personalize experiences across Klaviyo Marketing and Klaviyo Service. Our new Klaviyo service products are off to a fast start, increasing penetration faster than SMS did at the same point in its launch. Adoption is strong across all sizes of customers, from entrepreneurs all the way up to the mid-market and enterprise. In fact, last week, one of our customers, a large fashion business, signed a 7-figure renewal with us that included adding customer agent and customer hub across 6 of their portfolio brands. We view Klaviyo service as a long-term revenue engine with the potential to rival and exceed our marketing products as it scales. These launches further expand our multiproduct platform, making Klaviyo even more powerful for our customers. We consistently hear from customers about the importance of having one unified platform for engagement, and that's driving continued growth across the entire platform, including text messaging, WhatsApp and marketing analytics as well. Because our pricing model scales with the value we deliver, not with seats, our success grows directly alongside our customers. We price on a per profile, message and resolution basis, which lines up perfectly with the outcome-oriented business models AI is enabling. Today, more than half of our ARR comes from multiproduct customers, which is clear proof that customers want to have everything running off of one platform. This deepens our relationships with customers, improves retention and drives long-term growth. Turning now to international. Growth continues to accelerate. Revenue outside the Americas grew 43% year-over-year, our sixth consecutive quarter of faster international growth, with EMEA up 48% and gaining momentum from Q2. In Q3, we added 4 new languages to the platform, expanded text messaging coverage to 22 countries and introduced WhatsApp, which was a highly anticipated channel for our global customers. EMEA and APAC now represent more than 35% of total revenue, reflecting the strength of our international strategy. Our focused investments abroad are doing exactly what we intended. They're driving strong growth and expanding Klaviyo's global opportunity. Momentum in the mid-market and enterprise continues to build. We now serve 3,563 customers with over $50,000 in ARR. That's up 36% year-over-year, including a record 272 net adds this quarter. This was driven by a record number of new lands directly into the cohort. We're proud to welcome and expand with iconic mid-market and enterprise brands such as Bissell, Rhone, Books and Proper Hotels, brands that trust Klaviyo to deepen customer relationships and drive growth. Another global brand that exemplifies the power of what we're building is Meshki, an Australian-founded women's fashion brand now selling in over 190 countries. Meshki has embraced Klaviyo as its system of action, recently adding marketing analytics to power their omnichannel marketing. With Klaviyo, they're personalizing every touch point from product recommendations and campaigns to customer journeys and interactions, all powered by their own first-party data. Meshki also relies on Klaviyo as a central source of truth. As they scaled their U.S. presence, the team used Klaviyo to guide where to invest in infrastructure, shipping and local distribution, transforming customer data into operational decisions. It's a great example of what Klaviyo's B2C CRM is built to do, help brands grow faster and turn every interaction into long-term loyalty at global scale. Turning to the P&L. Non-GAAP gross margin was steady at 76%, in line with Q2 as benefits from scaling infrastructure balanced out the continued growth of text messaging. Importantly, non-GAAP gross profit growth accelerated, underscoring how we drive operating leverage as we scale. Non-GAAP operating expenses also saw broad-based leverage this quarter, improving 170 basis points year-over-year as a percentage of revenue, reflecting the power in our operating model and our ability to deliver strong growth while investing to capture an even larger AI-driven opportunity. Non-GAAP operating income for the quarter was $45 million with a 14.5% margin, up slightly year-over-year. This performance exceeded our guidance, driven by strong top line outperformance and disciplined execution. We generated $47 million in free cash flow for a 15% free cash flow margin, which was also up year-over-year. Turning now to guidance. We are entering the peak holiday season from a position of strength, supported by robust customer demand. For the fourth quarter, we are increasing our revenue expectations to $331 million to $335 million, representing 23% to 24% year-over-year growth. We expect fourth quarter non-GAAP operating income of $43.5 million to $46.5 million, representing a non-GAAP operating margin of 13% to 14%. As a reminder, we implemented profile enforcement earlier this year, which reduces seasonality in our Q4 and Q1 revenue, making quarter-on-quarter growth steadier over the course of the year. We do expect our fourth quarter non-GAAP gross margin to experience typical seasonal impact from increased text messaging volumes. Based on our strong third quarter and our momentum heading into Q4, we are raising revenue guidance for the full year by $18 million at the midpoint to $1.215 billion to $1.219 billion for year-over-year growth of 30%. We expect non-GAAP operating income of $161.8 million to $164.8 million, representing a non-GAAP operating margin of 13% to 14%. This will be another year of delivering results above Rule of 40. Rule of 40 is an important metric for us because it represents our commitment to strong growth with good unit economics. We will continue to invest to be the definitive CRM for B2C businesses, and we strive to deliver Rule of 40 as we do so. Looking ahead to 2026, we're confident in our growth trajectory and in the results we are seeing from our AI-powered growth engines. Based on that progress, we expect to deliver at least 21% to 22% revenue growth next year. Our core marketing products continue to deliver a strong foundation for growth. We expect to drive further adoption and expansion, particularly in mid-market, enterprise and international. And we're seeing meaningful early traction from our new AI-powered products. Our 2026 outlook currently assumes limited near-term revenue from these launches. That said, given the pace of adoption, the upside ahead of us is significant and creates clear long-term runway as these products scale. From a profitability standpoint, we expect to increase our 2026 non-GAAP operating margin by at least 1 percentage point from our updated 2025 guidance. To close, Q3 demonstrated Klaviyo's strength, high growth, strong unit economics and continued progress across our 3 growth engines: multiproduct expansion, international growth and mid-market and enterprise momentum. AI is accelerating our business. It is unlocking new possibilities for customers to use Klaviyo to connect with their consumers in smarter, more personalized ways. It amplifies our growth, and it strengthens our foundation for sustained leadership. We believe this is just the beginning. With our unique combination of first-party data, relentless product velocity and Agentic AI as a force multiplier, Klaviyo is positioned to be the definitive winner in the next era of consumer engagement. With that, we'll open up the call for questions. Operator?