Slash launches card payment processing for merchants

Slash has launched payment processing for approved merchants on its banking platform, allowing qualifying users to accept debit and credit card payments.

The service is available through card acceptance in Slash Invoicing and through a software development kit for customised web checkout and payment flows.

Approved merchants can create an invoice in Slash, enable card payments and track the customer payment process within the same account. They can also use the software tools to build their own checkout systems while viewing invoice-based and SDK-based payments in one dashboard.

The product also includes partial refunds, tracking of processed funds into Slash accounts and business spending, and a breakdown of payment fees tied to the relevant invoice or receivables context.

Single view

Slash is positioning the product as a way to bring payment acceptance into the same environment as other financial tasks. Many businesses still rely on separate providers for accounts, cards, invoicing, payment processing and accounting, which can leave finance teams without a complete view of cash flow and activity.

Andy Jiang, Head of Product, outlined the rationale for the launch.

"Operating a business in today's environment requires complete visibility into the entire financial lifecycle," said Andy Jiang, Head of Product, Slash. "Slash payment processing is designed to help increase that visibility and fill one of the blind spots that so many businesses today face in a consumer landscape dominated by credit or debit card payments."

The launch reflects a broader push by financial technology companies to combine services that merchants have often bought separately. Rather than asking businesses to connect several third-party products, firms across the sector are trying to keep more of the payments and treasury workflow in a single system.

Whop partnership

To support the new service, Slash is working with Whop on the underlying payments infrastructure. Under the arrangement, Whop will handle merchant onboarding, payment execution, settlement and other processor functions, while Slash will manage user-facing features such as the payments dashboard, refunds and payouts.

The approach lets Slash enter payment processing without building every layer of the card-processing infrastructure itself. It also reflects a common fintech model in which customer-facing companies rely on specialist infrastructure providers for regulated or operational functions behind the scenes.

Victor Cardenas, Co-Founder and Chief Executive Officer, said the partnership fits the company's wider plans.

"Each product and service that we launch is developed with the goal of becoming the financial operations system that businesses can rely on," said Victor Cardenas, Co-Founder and Chief Executive Officer, Slash. "Partnering with Whop enables us to deliver a reliable payment processing platform for our users that allows them to focus on running their business, and we are excited to see how this partnership unlocks true operational control for entrepreneurs and established businesses alike."

Initial sectors

The payment processing service is initially open to businesses in eCommerce, telehealth, software and service agencies, including marketing, advertising and consulting. This suggests Slash is starting with sectors where online card acceptance is central to day-to-day revenue collection and where software-led workflows are already common.

Founded in San Francisco, Slash offers business checking, corporate cards, expense management, treasury tools, global payments and stablecoin support through a single platform. It serves businesses in sectors including affiliate marketing, eCommerce, healthcare, home services and crypto.

Adding merchant payment acceptance extends that product set further into day-to-day transaction handling, moving Slash beyond storing and managing company funds into helping businesses collect them directly from customers.

For merchants, the appeal will likely depend on whether combining invoicing, payment acceptance, refund handling, and fund tracking in one place reduces administrative friction. For Slash, the launch provides another way to deepen its role in clients' financial operations and increase activity flowing through its platform.

The service is available to qualifying users through native invoicing tools and a software development kit for custom payment flows.