Singularity Edge
Payment gateway + electronic invoicing

Charge and invoice in a single step, with no data cross-checked by hand.

We connect your payment gateway (Stripe, PayU, Mercado Pago, Wompi, Conekta) to your electronic invoicing system so every payment automatically generates its corresponding invoice, in line with your country's tax regulations.

  • Invoice issued instantly as soon as the payment is confirmed.
  • Regulation compliant: Veri*factu (Spain), DIAN (Colombia), SAT/CFDI (Mexico).
  • Automatic credit notes for partial or total refunds.
  • Compatible with single payments, instalments and recurring subscriptions.
Gateway → InvoicingAutomatic
payment.confirmed ($450.000 COP)200 OK
↳ DIAN electronic invoice issued and stamped
refund.issued (parcial)200 OK
↳ Credit note generated automatically
invoice.sent (cliente)Delivered
↳ PDF + XML emailed to the customer
The administrative friction you have today

If your team invoices after taking payment, reviewing transactions by hand, this will sound familiar:

01 · Administrative delay

Invoices issued days after payment

Administration reviews the day's payments in the gateway and generates invoices manually, sometimes days after the payment actually landed.

02 · Risk of tax non-compliance

Tight electronic invoicing deadlines

Regulations (DIAN, SAT, Veri*factu) set specific deadlines for issuing and stamping that a manual process can miss without anyone noticing.

03 · Poorly documented refunds

Credit notes forgotten or generated late

A refund in the gateway that is never matched by its credit note, creating accounting discrepancies at month-end.

04 · Transcription errors

Amounts or tax details copied wrong

Transferring the amount and customer details from the gateway to the invoicing system by hand, where one transcription error produces an incorrect invoice.

Bespoke integration

Every confirmed payment triggers its invoice, instantly and in line with the law.

We build the bridge between your payment gateway and your electronic invoicing provider, respecting the specific tax regulations of each country you operate in.

Automatic issuing on payment

The invoice is generated and stamped the moment the gateway confirms the payment, with no manual intervention.

Automatic credit notes

A refund, whether total or partial, automatically generates the corresponding tax document, with no accounting discrepancies.

Regulatory compliance by country

We adapt numbering, stamping and format to the regulations in force: Veri*factu in Spain, DIAN in Colombia, SAT/CFDI in Mexico.

Recurring and instalment payments

Subscriptions and instalment payments generate an invoice for each actual charge, not one advance invoice for the total.

Automatic delivery to the customer

PDF and XML (or whichever format is required) are emailed to the customer automatically, with nobody attaching anything by hand.

Accounting reconciliation

Every invoice stays linked to the exact payment that produced it, making the monthly accounting close straightforward without manual matching.

Live integrations

Payment + invoicing integrations we have already built

🖋️

Electronic signature + invoicing in Ecuador

An automated connection between the payment gateway and the automatic issuing of official electronic signatures and invoices, with no manual intervention, for an electronic signature e-commerce business.

Typical result: Automatic regulatory compliance on every sale.
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Clinic with payments and DIAN invoicing

Payments for consultations and treatments taken through the gateway automatically generate the electronic invoice required by DIAN, linked to each patient.

Typical result: Zero invoices left to issue at the end of the day.
📅

SaaS with subscription and CFDI (Mexico)

Every recurring subscription charge automatically generates the corresponding CFDI and sends it to the customer with no administrative intervention.

Typical result: Invoicing up to date, month after month, with no repetitive manual work.
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Automatic refund handling

A refund processed in the gateway generates the corresponding credit note and updates the accounting status without the finance team intervening.

Typical result: Monthly accounting close with no discrepancies from refunds.
How we work

From the first call to a live integration

01

Free assessment

We review your payment gateway, your electronic invoicing provider (or help you choose an approved one) and your transaction volume.

02

Mapeo normativo

We confirm the exact legal requirements in your country: issuing deadlines, format, numbering and mandatory tax data.

03

Building the integration

We build the flow between the gateway and the invoicing system, covering refunds, partial payments and subscriptions.

04

Testing with test payments

We validate every scenario (single payment, refund, credit note, instalments) in a test environment before touching real transactions.

05

Deployment to production

We activate the integration with invoicing error monitoring, to detect any failure immediately.

06

Support and regulatory updates

We keep the integration current as regulations change (such as the new Veri*factu requirements in Spain).

Frequently asked questions

Common questions about payment and invoicing integration

Stripe and PayPal in Spain and the US, and in LATAM the most common ones by country: PayU, Mercado Pago, Wompi (Colombia), Conekta (Mexico) or Mercado Pago Argentina. If your business uses another gateway with an API, we can integrate that too.

It depends on the country: in Spain, systems compatible with Veri*factu and the forthcoming electronic invoicing requirement; in Colombia, technology providers authorised by DIAN; in Mexico, PACs authorised by SAT for CFDI. We integrate the provider you already use, or recommend one based on your volume.

Yes, that is precisely the objective: as soon as the gateway confirms the payment, the generation and stamping/numbering of the electronic invoice is triggered, without anyone in administration creating it by hand or cross-checking data between systems.

They are part of the flow: a refund automatically generates the corresponding credit note, and partial or instalment payments generate invoices or receipts aligned with each actual charge, rather than one advance invoice for the total.

That is precisely why this integration requires careful development: each country has different requirements for numbering, stamping, format (XML, signed PDF) and issuing deadlines. We design the integration around the regulations in force in your jurisdiction, not a generic template.

It depends on the electronic invoicing provider and whether you already have an approved one. With a provider already operating, the integration with the payment gateway is usually ready within a few weeks of the free initial assessment.

Let's talk about your
next project.

No sales pitch. A direct conversation about how automation and web development can transform your operation in the age of AI.

Support across Spain, LATAM and the USA

Spain · Colombia · Latam · USA
A direct reply and assessment in under 24 hours.

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