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

2026 年安全充值 PUBG Mobile UC 的最便宜方式PUBG MOBILE 专区

2026 年安全充值 PUBG Mobile UC 的最便宜方式

Zenless Zone Zero Season 2 Meta Guide | 5 Low Future-Proof Agents + Pull & Top-up Tips绝区零专区

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

PUBG MOBILE UC 退款指南:你需要了解的事项PUBG MOBILE 专区

PUBG MOBILE UC 退款指南:你需要了解的事项

《恋与深空》为何在全球爆火 | 游戏指南 + 通过 Topuplist 安全充值技巧Love and Deepspace Guides Hub

《恋与深空》为何在全球爆火 | 游戏指南 + 通过 Topuplist 安全充值技巧

PUBG MOBILE 支付失败:常见原因与解决方法PUBG MOBILE 专区

PUBG MOBILE 支付失败:常见原因与解决方法

《Genshin Impact》Nicole Reeyn 协同强度榜:角色兼容性全面解析原神专区

《Genshin Impact》Nicole Reeyn 协同强度榜:角色兼容性全面解析