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

Cheapest Way to Top Up Honkai: Star Rail? 2026 Oneiric Shards Discount Guide (Up to 6% Off)Honkai: Star Rail Guides Hub

Cheapest Way to Top Up Honkai: Star Rail? 2026 Oneiric Shards Discount Guide (Up to 6% Off)

Kebocoran Honkai Star Rail 4.4: Kit SP Himeko, Mekanik Ikatan Crossover Fate & Sokongan BaharuHonkai: Star Rail Guides Hub

Kebocoran Honkai Star Rail 4.4: Kit SP Himeko, Mekanik Ikatan Crossover Fate & Sokongan Baharu

Binaan Starlight Billy Terbaik dalam Zenless Zone Zero: W-Engines, Cakera Pemacu, Statistik dan PasukanZZZ Guides Hub

Binaan Starlight Billy Terbaik dalam Zenless Zone Zero: W-Engines, Cakera Pemacu, Statistik dan Pasukan

Kebocoran Pratonton Genshin Impact 7.0 Snezhnaya: Tsaritsa, 12 Watak Baharu, Pasukan Penuh SandroneGenshin Impact Guides Hub

Kebocoran Pratonton Genshin Impact 7.0 Snezhnaya: Tsaritsa, 12 Watak Baharu, Pasukan Penuh Sandrone

Honkai: Star Rail 4.3 Build Guide | Is Mortenax Worth Pulling? Eidolons, Light Cones, Teams & Best Top-Up StrategyHonkai: Star Rail Guides Hub

Honkai: Star Rail 4.3 Build Guide | Is Mortenax Worth Pulling? Eidolons, Light Cones, Teams & Best Top-Up Strategy

Kebocoran Genshin Impact 7.0 Voyanisha: Teaser Seni, Lore & 4 Kostum Baharu Akan DatangGenshin Impact Guides Hub

Kebocoran Genshin Impact 7.0 Voyanisha: Teaser Seni, Lore & 4 Kostum Baharu Akan Datang