PhD • Deep Learning • Payments (Acquiring) False Positives & False Negatives

AI for fraud detection in acquiring

This site showcases my PhD work focused on reducing false positives and false negatives in card-present and e‑commerce acquiring using Deep Learning, rigorous temporal validation, and LLM‑powered attack simulation. It includes projects, publications, governance, ethics, and impact.

See projects See publications

About us

CyberAntifraud is the umbrella for my PhD research (NOVA IMS) into merchant‑acquiring fraud prevention. The focus is to build robust deep learning methods to:

  • Detect sophisticated fraud patterns with strict temporal validation and drift control.
  • Reduce merchant friction and fraud loss by optimising the Precision–Recall trade‑off.
  • Simulate adversarial tactics with LLMs for robustness testing (fraud red‑teaming).
  • Operationalise pipelines across SAS/Oracle and Python/ML stacks.

Note: no sensitive data is disclosed; examples use synthetic or anonymised data.

Facts & Figures

1 TB
Transactional data (Oracle/SAS)
5+
DL families evaluated (RNN/Transformer/MoE/Autoencoder/GNN)
3
Target papers (Survey • Methods • Results)
Q1
Survey publication target

Regulations and Activity reports

The project tracks PSD2/PSD3, RTS SCA, EBA Guidelines, GDPR, NIS2 and reports from professional bodies (e.g., ACFE). We produce internal briefings on ML impact (data, explainability, retention, audit).

  • Internal briefings: [placeholders: links/PDFs]
  • Reg‑to‑ML mapping: requirements → data & metrics [placeholder]

Research team

NameRoleContact
Paulo Saramago Doctoral Researcher • Fraud & Deep Learning (Acquiring) paulo@cyberantifraud.com
[Supervisor] Scientific supervision [email]
[Co‑supervisor] Methods/Infra [email]

Governance

  • Steering: supervisors + fraud & compliance stakeholders.
  • Reviews: quarterly checkpoints (metrics, drift, error cost).
  • Change control: data/model versioning (MLflow/DVC).

Scientific Advisory Board

  • [Name • Affiliation • Role]
  • [Name • Affiliation • Role]

Research Management and Development

  • Data management: field catalog (MCC, device, geo, 3DS, etc.), PII segregation.
  • Validation: blocked time‑series CV, rolling windows, ensembles & MoE.
  • Ops: SAS ↔ Python pipelines, testing, observability, feature store.

Equality, Culture, Diversity, and Inclusion

Commitment to non‑discrimination and bias assessment in models (auditability & fairness).

Research Ethics

Principles: data minimisation, legitimate anti‑fraud purpose, operational explainability, explicit error‑cost evaluation (customer vs. risk), full documentation for audit.

Sustainable Development

Reduce payment friction and fraud loss (economic impact) and improve green compute efficiency.

Work with us

Open to academic/industry collaboration on:

Dataset shift & Drift MoE for Fraud GNN on merchant networks LLM Red Teaming Real‑time Explainability

Contact: collab@cyberantifraud.com

Labs & Innovation

Data Analytics Lab

Feature engineering and cost‑aware metrics (precision/recall calibrated to €).

Information Systems & Analytics Lab

Integrating SAS/Oracle with Python pipelines and data governance.

Innovation & Fraud Simulation Lab

LLM‑generated attack scenarios and robustness evaluation.

Blockchain Lab

Exploring on/off‑chain signals for transactional risk (where applicable).

Business Intelligence & Analytics Lab

Operational dashboards (fraud, friction, net benefit).

Applied Economics & Analytics Lab

Cost‑benefit models and decision policy optimisation.

Projects

CYBERANTIFRAUD — Reducing FP/FN in payments with Deep Learning

Duration: [2025–2027] • Funding: [tbd] • Website: [link]

About the Project

We design a hybrid architecture (e.g., Mixture‑of‑Experts using Transformers/RNNs/Autoencoders) and a rigorous temporal validation protocol to reduce false positives (merchant friction) and false negatives (fraud loss).

Our Contribution

  • Composite contextual risk indicators (MCC, channel, device, geo).
  • Merchant clustering and peer‑group thresholds.
  • Adversarial simulation with LLMs for pre‑production robustness tests.

Partnership

[University • Industry • Regulators • Tech partners]

Funding

  • Programme: [FCT/EU/Industrial]
  • Total: [€]

NOVA IMS Team

  • Paulo Saramago — Researcher/Doctoral Student
  • [Supervision]

News about the Project

  • [YYYY‑MM‑DD] Kickoff & cost‑metric definition
  • [YYYY‑MM‑DD] Temporal CV protocol published

Contribution to the SDGs

Economic efficiency (lower loss and friction), responsible innovation, and trust in digital payments.

Fraud Attack Simulation (LLM) • Open‑source MVP

Public repository with LLM‑generated attack scenarios and a harness to test fraud classifiers: [GitHub link].

  • Stratified adversarial prompt generator per channel.
  • Robustness metrics and canary tests before promoting models.

Publications

YearTitleTypeLink
[2025] Survey: Deep Learning for Acquiring Fraud Detection — metrics, temporal validation and robustness Paper (Q1 target) [DOI/Preprint]
[2025] Methods: Time‑series CV protocol and error‑cost modelling Paper [DOI/Preprint]
[2026] Results: MoE + Transformers vs. baselines on real acquiring data Paper [DOI/Preprint]

Others: talks, posters, tech reports, synthetic datasets — [links]

Education • Society

Schools

Workshops and guest lectures on AI‑enabled fraud, ethics and risk assessment.

Podcasts

“CyberAntifraud” series interviewing researchers and fraud leaders. [link]

Citizen Science

Awareness materials on safe payments for merchants and consumers. [materials]

In the media

Selected articles and interviews. [clippings]

Research lines • Highlights • Impact • Profile • Awards

Research lines

  • Hybrid architectures (MoE, Transformers, Autoencoders, GNN).
  • Temporal validation, drift and continual learning.
  • Operational explainability.

Key impact areas

  • Less merchant friction with equal or higher security.
  • Reduced fraud loss.
  • Simplified audit and compliance.

Research profile

Applied focus, methodological rigour, full documentation and controlled reproducibility.

Awards and distinctions

[tbd]

Contacts

CyberAntifraud • Lisbon, Portugal

Email: hello@cyberantifraud.com

Social: LinkedInGitHubTwitter

Whistleblower Portal: [link] • Privacy Policy: [link]

Accreditations & Partners

ACFE ISO NOVA IMS

Co‑funding/support: [FCT/EU/Industry]