Nina Castellano

Nina Castellano

Nina Castellano is a digital payments analyst turned writer, based in London. She spent four years at a European fintech startup, where she specialized in cross-border transaction fees, e-wallet ecosystems, and how payment gateways influence top-up costs for gamers and streamers. That behind-the-scenes experience taught her exactly where hidden surcharges hide—and how to avoid them. Now an independent contributor, Nina focuses on making the payment side of top-ups transparent and user-friendly. From comparing PayPal, Apple Pay, and local e-wallet options to breaking down currency conversion markups, she tests every method herself and reports back with clear, actionable findings. Her guiding principle is simple: every pound spent on fees is a pound not spent on the fun.

London
DigitalPaymentsCrossBorderFeesEwalletsFintechForGamers

Experience

Professional Experience

2024 - Present

Payment Specialist

Nina helps users navigate the payment side of top-ups—comparing methods, cutting fees, and maximizing value on every recharge.

2022 - 2024

Freelance Finance & Gaming Writer

Whose practical guides on avoiding hidden payment surcharges have been featured in fintech and gaming publications.

2016-2022

Payment Operations Analyst

Where she spent four years investigating cross-border transaction fees, e-wallet integrations, and payment gateway markups.

Credentials

Certificates & Qualifications

  1. 01

    Certified Payments Professional

    Issued by the Electronic Transactions Association — validating expertise in payment systems, compliance, and cross-border transaction frameworks.

  2. 02

    Google Data Analytics Professional Certificate

    Specializing in transaction data analysis, fee pattern identification, and consumer payment behavior insights.

  3. 03

    AML & Financial Crime Prevention Certificate

    Focused on anti-money laundering regulations and fraud detection in digital payment ecosystems.

Articles by Nina Castellano

La forma más barata de recargar UC de PUBG Mobile de forma segura en 2026PUBG MOBILE Guides Hub

La forma más barata de recargar UC de PUBG Mobile de forma segura en 2026

Zenless Zone Zero Season 2 Meta Guide | 5 Low Future-Proof Agents + Pull & Top-up TipsZZZ Guides Hub

Zenless Zone Zero Season 2 Meta Guide | 5 Low Future-Proof Agents + Pull & Top-up Tips

Guía de reembolso de UC de PUBG MOBILE: lo que necesitas saberPUBG MOBILE Guides Hub

Guía de reembolso de UC de PUBG MOBILE: lo que necesitas saber

Por qué Love and Deepspace se hizo viral en todo el mundo | Guía del juego + consejos para recargar de forma segura a través de TopuplistLove and Deepspace Guides Hub

Por qué Love and Deepspace se hizo viral en todo el mundo | Guía del juego + consejos para recargar de forma segura a través de Topuplist

Pago fallido en PUBG MOBILE: motivos habituales y solucionesPUBG MOBILE Guides Hub

Pago fallido en PUBG MOBILE: motivos habituales y soluciones

Lista de niveles de sinergia de Nicole Reeyn en Genshin Impact: desglose completo de compatibilidad de personajesGenshin Impact Guides Hub

Lista de niveles de sinergia de Nicole Reeyn en Genshin Impact: desglose completo de compatibilidad de personajes