Companies Using Authorize.net in London: 80 Active Firms (2026)
London companies running payment gateway technology on their websites take online card payments for retail, services and subscriptions.
Payment-gateway adoption usually sits with commercial, finance and operations teams rather than a purely technical buying centre. The relevant London users are transaction-led businesses: ecommerce operators, subscription services, booking-led service firms, membership organisations and donation-funded sites that need checkout, account billing and fulfilment to work together. The adoption signal is therefore practical. These are not brochureware sites; they have enough payment volume to justify embedded checkout or hosted payment pages, with web, finance and customer-support teams sharing responsibility for failed payments, refunds and reconciliation. SaaS, education and training, construction and field-service operators all appear in the mix, suggesting a broad SME-to-mid-market pattern rather than a narrow vertical use case.
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London has 80 actively trading companies running this payment-gateway technology on their public websites. Reported headcount across the cohort totals 487, pointing to an adoption base weighted toward lean operators as well as a smaller set of larger employers. The user mix leans toward SaaS at 25%, with education and training at 12.5%; startup, field services and trades, and construction each account for 10%. The middle of the commercial distribution looks modest, with median turnover at about £437,000. Co-detected infrastructure is common: cloud security appears on 76.3% of sites, analytics on 46.3% and tag management on 43.8%.
Card-payment use brings procurement and control questions that tend to involve finance, operations, web development and customer support. A London merchant using an embedded checkout or hosted payment page still has to decide where payment-related personal information is stored, who can see order and billing records, and how refunds, chargebacks and failed recurring payments are handled. Frequent co-occurrence with security, analytics and automation tools suggests these sites are rarely payment-only deployments. Cookie consent, fraud checks and customer account access sit close to the checkout path, so implementation quality depends as much on governance and hand-offs as on the gateway contract.
Adoption appears likely to remain pragmatic rather than fashionable. Smaller merchants tend to keep a gateway in place while it works, then reconsider it when checkout conversion, subscription recovery or accounting reconciliation becomes painful. Larger operators are more likely to be pulled toward bundled commerce platforms, embedded finance features and payment orchestration, which can reduce the role of a standalone gateway over time. For London users, the interesting split is between firms treating online payment as a utility and those building customer journeys around recurring billing, bookings and self-serve account management. The latter group appears more exposed to migration and integration pressure.
What’s in the file
One row per company, 50+ columns — everything below plus each company’s verified directors, from Companies House filings.
Company data
Verified directors — included
Adoption by company size
Adoption of Authorize.net rises with company size across the trading companies in this cohort. 0% of the 532,485 companies with under 10 employees run Authorize.net (54 detected). 0.1% of the 15,364 companies with 10–50 employees run Authorize.net (19 detected). 0.3% of the 1,763 companies with over 50 employees run Authorize.net (5 detected). That is a 0.3% gap between the over 50 employees and under 10 employees bands.
80
Active firms
2026
6
Above £5M turnover
Trading firms
6
Median headcount
Filed accounts
150
Verified directors
Across this cohort
Top companies using Authorize.net in London
Ranked by sales-readiness score: an AI model assesses what each company does, its sector and size, and scores its overall fit. Best-fit prospects appear first.
Financial sub-scores
Computed from 3 filingsOperates an online retail marketplace selling fashion and lifestyle products including jewellery, clothing, footwear, handbags, sunglasses, luggage and accessories for men and women, with products…
Serves online B2C shoppers, primarily men and women buying fashion items, jewellery, shoes, handbags, accessories, luggage, and home lifestyle products.
Financial Health
StrongStrong · Hiring · 32% CAGR over 2y
Location
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Designs and sells luxury footwear, handbags, leather goods, accessories and beauty products for women and men. Offers pumps, sneakers, boots, bags, small leather goods, eyewear, fragrances and…
Sells to luxury fashion consumers, including women, men, parents shopping for children, bridal parties, wedding guests, and gift buyers via its online boutique.
Location
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Financial sub-scores
Computed from 5 filingsDevelops and operates a software platform providing marketing and sales automation tools, including sales funnel builders, website and landing page creation, email and SMS marketing, CRM management,…
Sells to small businesses, online entrepreneurs and creators that need marketing, sales funnel, CRM, course, membership, booking and customer communication tools to launch or grow an online business.
Financial Health
StableStable · 0% CAGR over 4y
Location
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Financial sub-scores
Computed from 5 filingsDevelops and operates an online form‑building platform that lets users create surveys, registration and order forms, collect payments, and manage submissions, with integrations to business apps,…
Serves businesses, nonprofits, government bodies, healthcare providers, educators, churches, camps, restaurants, agencies and individual professionals that need online data collection, payments and…
Financial Health
StrongStrong · Growing, Hiring · 58% CAGR over 2y
Location
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Financial sub-scores
Computed from 3 filingsSupplies and distributes food and catering products including fresh poultry, fries, sauces, cooking oils, breading and flour mixes, drinks, and related packaging and hygiene supplies through an…
Serves foodservice buyers such as takeaways, fast-food outlets, restaurants and caterers needing poultry, fries, sauces, breading, drinks, packaging and hygiene supplies.
Financial Health
HealthyHealthy · Hiring · 33% CAGR over 2y
Location
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Financial sub-scores
Computed from 5 filingsOperates an online shop selling aftermarket automotive parts, specialising in fiberglass body panels and styling components for vehicles including BMW, Nissan, Toyota, Honda, Porsche and other…
Sells to individual car enthusiasts, modifiers and restoration buyers seeking aftermarket parts for specific Japanese, European and American performance and classic car models.
Financial Health
HealthyHealthy · -10% CAGR over 4y
Location
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Financial sub-scores
Computed from 5 filingsProvides virtual office and registered address services for companies, allowing businesses to use UK addresses for Companies House and HMRC correspondence. Offers mail handling and scanned letter…
Serves entrepreneurs, company directors and UK limited companies, including overseas business owners seeking UK corporate address and filing support.
Financial Health
WeakWeak · -12% CAGR over 4y
Location
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Financial sub-scores
Computed from 5 filingsSources, imports, and supplies specialty green coffee beans to coffee roasters and businesses. Offers wholesale purchasing through an online platform, with coffees sourced from producing regions…
Sells B2B to coffee roasting businesses and wholesale green coffee buyers seeking specialty coffees, curated lots, decaf, organic and origin-specific beans.
Financial Health
StableStable · -67% CAGR over 4y
Location
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Financial sub-scores
Computed from 4 filingsProvides an online software platform for coaches and consultants to build sales funnels, host online courses, manage leads, automate email follow-ups, process payments, and create WordPress-based…
Serves coaches and consultants running digital businesses, particularly solo or small service providers seeking an all-in-one system for lead generation, funnels, courses and client follow-up.
Financial Health
DistressedDistressed · -16% CAGR over 3y
Location
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Financial sub-scores
Computed from 5 filingsOperates an online retail store selling home improvement and household products, including lumber, tools, housewares, outdoor furniture, BBQ grills, lawn care items, and pet supplies, with product…
Serves retail consumers including homeowners, DIYers, gardeners, outdoor living shoppers and pet owners, with some appeal to tradespeople or contractors buying hardware and lumber supplies.
Financial Health
DistressedDistressed · -15% CAGR over 4y
Location
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Financial sub-scores
Computed from 3 filingsDevelops and provides cloud-based accounting software for small businesses, offering tools for invoicing, expense tracking, bank reconciliation, inventory, tax management, financial reporting, and…
Sells primarily to startups, small and growing businesses, nonprofits, and accounting/bookkeeping firms, with users including business owners, finance teams, accountants, and bookkeepers.
Financial Health
StrongStrong · Growing, Hiring · 409% CAGR over 2y
Location
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Financial sub-scores
Computed from 2 filingsDevelops coworking space management software that handles member management, desk and room bookings, billing and invoicing, access control, event management, and reporting. The platform includes…
Serves B2B coworking space operators, flexible workspace providers and smart office teams, including multi-location networks, across 90+ countries.
Financial Health
HealthyHealthy
Location
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Financial sub-scores
Computed from 5 filingsOperates a fitness gym offering membership access to strength and cardio equipment, workout facilities and gym tours. Runs fitness programmes such as 21‑day challenges and provides a structured…
Serves local consumers in Bromley and Greater London seeking gym memberships, fitness challenges, gym tours, and a less crowded, friendly workout environment.
Financial Health
HealthyHealthy · Hiring · 5% CAGR over 4y
Location
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Financial sub-scores
Computed from 5 filingsDevelops and provides cloud-based business communication and IT support software, including VoIP phone systems, video meetings, webinar hosting, contact centre platforms, and remote endpoint…
Targets businesses of all sizes, including automotive dealers, education providers, healthcare organisations, retailers and government bodies, plus IT teams and managed service providers.
Financial Health
StableStable · Hiring · 32% CAGR over 4y
Location
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Financial sub-scores
Computed from 5 filingsProvides cloud-based communications and productivity services including VoIP business phone systems, video conferencing, team messaging, contact centre software, business email, file backup, and…
Serves B2B customers including small businesses, healthcare, legal, financial services, automotive, retail and education organisations, plus MSPs, VARs, service providers and carriers.
Financial Health
StableStable · -64% CAGR over 4y
Location
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Financial sub-scores
Computed from 5 filingsSupplies branded merchandise and promotional products for businesses, including custom kits, corporate online merchandise stores, and campaigns linking physical products to digital experiences.…
Serves businesses and charities, especially marketing managers, HR directors, sales teams and fundraisers seeking branded merchandise programmes, online company stores, employee/customer gifting and…
Financial Health
StrongStrong · Profitable, Growing, Hiring · 9% CAGR over 4y
Location
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Financial sub-scores
Computed from 5 filingsDevelops cloud-based software for wholesalers of home decor, furniture, gifts and garden products, providing order management, B2B ecommerce, inventory and warehouse management, accounting, CRM, and…
Targets B2B wholesalers and brands in home decor, gifts, furniture, garden, lifestyle and related product categories, especially firms selling through multiple wholesale, ecommerce, marketplace and…
Financial Health
StrongStrong · Growing, Hiring · 19% CAGR over 4y
Location
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Financial sub-scores
Computed from 5 filingsProvides card payment processing solutions for businesses, including countertop, portable and mobile card machines, online payment gateways and EPOS systems. Also offers merchant cash advances,…
Serves UK businesses that need card and online payment acceptance, including retail stores, restaurants and hospitality operators, mobile service providers and e-commerce merchants.
Financial Health
StrongStrong · Hiring · 22% CAGR over 4y
Location
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Financial sub-scores
Computed from 2 filingsProvides merchant payment processing services, enabling businesses to accept card and digital payments in person, online and via mobile. Offers payment gateways, fraud and security tools, reporting…
Serves small businesses, enterprises, public sector bodies and nonprofits across retail, eCommerce, restaurants, hospitality, healthcare, education, automotive and transit, plus partners such as…
Financial Health
WeakWeak · Hiring · 20% CAGR over 1y
Location
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Financial sub-scores
Computed from 4 filingsDevelops cloud-based payment orchestration software that integrates payment service providers, payment methods and fraud tools through a single platform. Enables merchants and platforms to manage…
Serves enterprise merchants and digital platforms, including ed-tech and fintech businesses, that manage online checkout and payments across multiple providers and geographies.
Financial Health
HealthyHealthy · Hiring · 13% CAGR over 3y
Location
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Financial sub-scores
Computed from 3 filingsDevelops cloud-based retail software including mobile point‑of‑sale, order management, inventory control, CRM and analytics tools. Platform supports omnichannel retail operations such as…
Serves enterprise retailers and venue-based merchants, especially high-end apparel, footwear and apparel brands, museums, stadiums and arenas seeking omnichannel commerce operations.
Financial Health
StrongStrong · Hiring · 18% CAGR over 2y
Location
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Financial sub-scores
Computed from 5 filingsProvides merchant payment processing services, including credit card and mobile payments, payment gateways, terminals, and e‑commerce processing. Also offers gift and loyalty card programs, text…
Serves small and medium-sized businesses in retail, restaurants, hospitality, B2B commerce, eCommerce, trade shows and special events, including physical-location and online merchants.
Financial Health
WeakWeak · Hiring · 14% CAGR over 4y
Location
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Computed from 4 filingsProvides online fitness coaching and personal training programmes offering guidance on weight loss, muscle building, nutrition, and lifestyle habits. Coaches deliver tailored training plans and…
Serves individual consumers, mainly adults in the UK, seeking weight loss, muscle gain or healthier lifestyle habits, including women looking for body-confidence and pre/post-natal support.
Financial Health
HealthyHealthy · 0% CAGR over 3y
Location
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Computed from 2 filingsDevelops software applications that extend Salesforce functionality, including tools for telephony and Microsoft Teams integration, payments management, reporting, document generation, activity…
Sells to enterprise Salesforce users, including organisations in healthcare and life sciences, financial services, manufacturing, consumer goods and recruitment, plus Salesforce ecosystem partners…
Financial Health
WeakWeak · Hiring · 166% CAGR over 1y
Location
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Computed from 5 filingsProvides arts and crafts workshops, clubs and short courses for adults, children and teens, including sewing, painting, jewellery and sculpting. Organises holiday clubs, birthday parties and private…
Sells to consumers, mainly adults, children, teens and families seeking arts and crafts activities, plus private party bookers and corporate event organisers. Serves local customers in South-west…
Financial Health
WeakWeak · Hiring · 44% CAGR over 4y
Location
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Computed from 3 filingsOperates a personal training gym offering small‑group fitness coaching sessions. Provides structured exercise programmes, introductory consultations and short‑term trial memberships for adults…
Serves local B2C customers in Wanstead, mainly busy adults and people uncomfortable with traditional gyms who want coached, supportive small-group fitness sessions.
Financial Health
StableStable · Hiring · 58% CAGR over 2y
Location
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Computed from 5 filingsDevelops software applications for Windows, cloud, and mobile platforms, including Microsoft Outlook add-ins and productivity tools for email automation and data management. Also provides custom…
Serves enterprises and individual users worldwide, especially Microsoft Office 365, Outlook and Windows users in businesses needing productivity, email automation and business data management tools.
Financial Health
DistressedDistressed
Location
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Computed from 5 filingsDevelops cloud-based quoting and business automation software for managing sales leads, quotations, orders, projects, procurement, inventory and invoicing. The platform integrates with accounting,…
Serves B2B sales, operations and finance teams in sectors including promotional products, construction and trade, office furniture, audio-visual, lighting and renewables.
Financial Health
DistressedDistressed · -3% CAGR over 4y
Location
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Computed from 5 filingsOperates day nurseries providing early years childcare and pre‑primary education. Delivers play‑based learning, child‑centred curriculum activities, supervised care, meals, and outdoor learning for…
Serves B2C parents and families with pre-school children seeking early years nursery places, mainly around Ilford, Islington, Leytonstone and nearby London communities.
Financial Health
StrongStrong · Growing, Hiring · 6% CAGR over 4y
Location
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Financial sub-scores
Computed from 5 filingsProvides corporate training and professional development courses, including Ofqual-regulated and postgraduate qualifications. Delivers bespoke training programmes for businesses and individuals,…
Serves SMEs, multinational corporations, government bodies, and individual professionals seeking corporate training and postgraduate qualifications for staff development, compliance, productivity,…
Financial Health
StrongStrong · Growing, Hiring · 19% CAGR over 4y
Location
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Financial sub-scores
Computed from 3 filingsProvides market research reports, industry analysis, and advisory services focused on emerging technologies and high‑growth sectors. Produces syndicated and custom B2B research covering areas such as…
Targets B2B enterprises worldwide, especially CMOs, CROs, chief strategy officers and technology or innovation leaders across technology, healthcare, energy, chemicals, automotive, aerospace, food,…
Financial Health
HealthyHealthy · Hiring · 41% CAGR over 2y
Location
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Computed from 3 filingsOperates a community pharmacy providing NHS and private prescriptions, over‑the‑counter medicines, and pharmacist consultations. Offers healthcare services including travel vaccinations, flu jabs,…
Serves local residents and patients in East London, including NHS prescription users, private healthcare customers, travellers needing vaccinations, and adults seeking weight loss, men’s/women’s…
Financial Health
WeakWeak · Hiring · 12% CAGR over 2y
Location
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Computed from 5 filingsProvides private speech and language therapy for children and young people, including assessment and treatment for communication delays, autism, stammering and auditory processing issues. Works with…
Serves families of children and young people with speech, language and communication needs, alongside schools, local authorities, NHS/ICBs and healthcare institutions seeking paediatric support in…
Financial Health
StableStable · Hiring · 17% CAGR over 4y
Location
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Computed from 5 filingsManufactures and supplies cleanroom consumables and contamination‑control products, including wipes, presaturated wipes, swabs, mops, masks, cleanroom paper and accessories used in controlled…
Sells to B2B and institutional buyers operating controlled or regulated environments, including aerospace and defence, pharmaceutical, automotive, healthcare, medical device, food manufacturing,…
Financial Health
HealthyHealthy · Hiring · 3% CAGR over 4y
Location
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Computed from 5 filingsProvides childcare and early years education for children from birth to five years. Offers nursery sessions, full‑day care, and structured learning based on the Early Years Foundation Stage, with…
Serves parents and guardians of babies, toddlers and preschool children from birth to five, particularly families seeking nursery places in Harrow Weald and Canons Park.
Financial Health
HealthyHealthy · Hiring · 15% CAGR over 4y
Location
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88 more companies and their verified directors are in the file
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Key facts
About 7% of the trading cohort reports turnover above £5M (6 of 80 firms) — the rest sits below that revenue band.
15% of the cohort was incorporated since 2022 (12 firms), so a sizeable share is in its first few filing cycles.
Network-edge tooling appears alongside the payment gateway in 76.3% (61) of the London cohort, suggesting checkout pages are commonly paired with delivery or security layers.
Marketing-automation overlap is visible in 50.0% (40) of the cohort, pointing to sales funnels and repeat-customer workflows around card payments.
Measurement tooling is common around payment pages: 46.3% (37) run analytics tagging and 43.8% (35) run tag-management tooling.
Sector tags overlap, with SaaS at 25.0% (20), Education & Training at 12.5% (10), and Field Services & Trades and Construction each at 10.0% (8).
Financial-health tags are mixed: 17.5% (14) are stable, while 13.8% (11) are weak and 11.3% (9) distressed.
What else do Authorize.net users run?
Share of the 80 Authorize.net-running UK companies where each technology was also detected. As of June 2026.
Who runs Authorize.net in the UK?
By sector
Sectors overlap, so shares need not sum to 100%.
By financial health
From filed accounts; firms with fewer than two filings show as insufficient history.
6
Median headcount
£436.8K
Median UK turnover
7.5%
Above £5M turnover
12
Incorporated since 2022
Verified directors — included in the file
Director names and roles for these 123 companies, alongside financials and websites, in one Excel + CSV file.
How Authorize.net usage is detected
Company data
Detected companies are joined to UK Companies House records and XBRL accounts data. Revenue and headcount figures come from the most recent filed accounts; where the company has not filed, values are estimated using a model trained on filed history and peer benchmarks and are labelled as estimates.
Detection
Firmbase crawls the public website of actively-trading UK companies and fingerprints the technologies present: tracking scripts, embedded forms, chat widgets, CMS markers and similar signatures. A company is included in this list when one or more of the technology's signatures are found on its site; closely-related variants of the same product are grouped under one name. Detection covers what is visible on the public web — a company using the technology purely internally, with no website footprint, will not appear. Counts are therefore a conservative floor, not a ceiling.
Freshness
Websites are re-crawled on a rolling basis and the underlying company data is refreshed from Companies House continuously; filings appear within days of submission. The list and its statistics are regenerated when the detected cohort moves meaningfully. You can see the last-updated timestamp near the top of the page.
Authorize.net is a trademark of its respective owner. Firmbase is not affiliated with, sponsored by, or endorsed by the trademark owner.
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Frequently asked questions
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