Invoicing through your customer's supplier portal: Coupa, SAP Ariba, Jaggaer, Tungsten and more

Win a large customer and the purchase order often arrives with a set of instructions: register on our supplier portal, and invoice through it. One portal is a chore you can live with. Three or four, each with its own login and its own way of raising an invoice, is a part-time job.

What is a supplier portal, and why does your customer use one?

A supplier portal is the supplier-facing side of a buyer's procurement system. The buyer runs purchasing, receipting and invoice approval in that system, and the portal is where you, the supplier, see their purchase orders and send back invoices.

Coupa describes its own portal this way: the Coupa Supplier Portal (CSP) "is a free tool for suppliers to easily do business with their customers who use Coupa." What you can do inside it is set by the buyer. In Coupa's words, "Depending on the customer's specific Coupa configuration, suppliers can manage content and settings on a customer-by-customer basis".

The portal belongs to your customer, so the rules do too. Two buyers on the same platform can ask for different things.

How do suppliers invoice through Coupa, SAP Ariba, Jaggaer and Tungsten?

Each portal offers a manual route and at least one automated route. This table sets out what each portal's own documentation says, alongside the matching Transalis connection page.

Coupa: is the Coupa Supplier Portal free, and can invoicing be automated?

Yes on both counts. Coupa calls the CSP a free tool, and it lists cXML as the automated route. Its getting-started page names four ways to send invoices to a customer who uses Coupa: Supplier Actionable Notifications, the CSP, cXML, or email/PDF. Supplier Actionable Notifications let you receive orders and work with customers who use Coupa without joining Coupa's supplier network or creating a CSP account.

The Coupa Invoices FAQ adds a CSV file uploaded via sFTP, and it is clear that the choice starts with your customer: "You should talk to your customer about which of the following methods they want to use". In the CSP, you sign in and manually flip a purchase order to create an invoice. With cXML, you automate sending an invoice file in Coupa's standard cXML format.

Coupa also maps each route to volume. On its invoices page, the CSP is "ideal for suppliers with low to medium volume purchase orders and invoices", while cXML "is suitable for suppliers with a high volume of purchase orders, or who automate their invoicing."

Two details are worth knowing before you choose. Once an invoice is submitted in Coupa, it cannot be changed in any way. And if you email a PDF, Coupa warns that your customer might have to key the details in by hand, which may delay payment.

SAP Ariba: when does SAP Business Network charge suppliers?

SAP's own training material now uses the name SAP Business Network. Its supplier fees course says the fee schedule has two parts, subscriptions and transaction fees, and that there is no fee for the standard level subscription. All accounts are free to start.

According to SAP, an account becomes chargeable once a supplier crosses both thresholds with one buyer, 5 documents and $50K USD, in a rolling 12-month period, and it is then chargeable across all buyer relationships. The same course sets out SAP's transaction-fee rates and annual caps.

Automation sits on the paid side. As of October 2026, SAP's course says suppliers who require cXML or EDI support must enrol at least at the Silver enterprise level. These are SAP's own fees, set and charged by SAP, so check SAP's current schedule for your own account before you plan around them.

Jaggaer: how do suppliers invoice?

Jaggaer's invoicing page says suppliers can flip approved purchase orders into invoices directly from the Supplier Portal. On the buyer side, Jaggaer lists the routes it captures invoices through: portal, email, EDI, cXML, OCR, Peppol and global eInvoicing networks. So a Jaggaer buyer can take structured invoices, not just portal entries.

Tungsten Network: how do suppliers invoice?

Tungsten Network's supplier FAQ for Tesco says both the buyer and the seller must be members of the network. It offers two levels of electronic invoicing: a web form and an integrated route. The same FAQ says that within 24 hours of joining, you can be sending those customers eInvoices.

For a wider view of what each of these platforms does for the buyer, see our guide to the top procure-to-pay integrations.

Why does keying invoices into several portals stop working?

Because the work multiplies with every customer, and none of it is shared. Each portal has its own login, its own invoice screen and its own rules, set customer by customer. Your team learns Coupa for one buyer, SAP Business Network for another and Tungsten for a third, then re-keys data your own system already holds. And in Coupa, a keyed invoice cannot be changed once it is submitted.

The portal vendors draw the same line. Coupa positions manual entry for low to medium volumes, and cXML for suppliers with high volumes or who automate.

We look at the wider cost of trading on different buyer platforms in procurement technology: what suppliers need to consider. The short version for invoicing: the more portals you serve, the stronger the case for sending structured data instead of typing.

How can one connection reach your customers' portals?

Connect once to a managed network instead of logging into each portal. Transalis connects suppliers to procurement portals, including Coupa, SAP Ariba, Jaggaer and Tungsten, with fully managed EDI. On its Coupa page, Transalis describes "automated orders, despatch notes and invoicing across a network of 15,000+ connections", with no EDI software or knowledge required.

On its EDI page, Transalis states that one connection reaches 15,000+ trading partners across 50+ countries, with no software to run and no per-transaction penalty. Transalis handles format translation and the import of each message, so your team stops re-keying invoices into each customer's screen.

It works at scale. In one Transalis case study, a stationery supplier used a four-stage onboarding process to bring all 300 customers across 15 procure-to-pay platforms live within nine weeks.

Pricing is predictable. Every Transalis quote is built from a one-time setup and partner-mapping fee, a one-time integration and automation fee, and a monthly subscription for platform access and managed services. Fees a portal charges you directly, such as SAP Business Network's supplier fees, are set by that portal.

Which supplier portals does Transalis connect to?

Transalis has confirmed live connections to these procurement and invoicing portals:

• Amazon Payee Central
• Basware (public and private sector)
• Birch Street
• Causeway (Tradex)
• CloudBuy
• Coupa
• Fexco
• Fourth Hospitality
• Harvey Nichols
• Jaggaer
• OneAdvanced
• Paragon CC
• Proactis
• SAP Ariba
• SAP Rosderra
• Tungsten
• Workday

Most of these platforms have their own page in the Transalis trading network and integrations directory.

Supplier portal, EDI or Peppol: what is the difference?

A supplier portal is a screen your customer gives you. EDI is a connection between your system and theirs. Peppol is an open network for exchanging structured documents such as eInvoices. They answer the same question in three different ways.

These routes are not rivals. Jaggaer, for one, lists portal entry, EDI, cXML and Peppol among the ways it captures invoices. Transalis is an authorised Peppol Access Point, so one provider can carry both EDI and Peppol traffic. As the Transalis eInvoicing page puts it, "A separate portal for every mandate fractures your data estate." The same is true of a separate login for every customer.

Invoice your customers' portals from one connection

If your largest customers each want invoices through a different portal, start with the list of portals you serve today. Bring that list to a call, and we will walk through how each one connects. Book a meeting to map your portal connections.