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

Genshin Impact Lohen 6.6 가이드: 최초의 온필드 서브 DPS, 최고의 팀 조합 및 뽑기 우선순위Genshin Impact Guides Hub

Genshin Impact Lohen 6.6 가이드: 최초의 온필드 서브 DPS, 최고의 팀 조합 및 뽑기 우선순위

Arena Breakout 충전 가이드 2026: Bonds를 안전하게 구매하는 방법Arena Breakout Guides Hub

Arena Breakout 충전 가이드 2026: Bonds를 안전하게 구매하는 방법

Honor of Kings 충전 가이드 2026: HOK 토큰을 안전하고 즉시 구매하는 방법Honor of Kings Guides Hub

Honor of Kings 충전 가이드 2026: HOK 토큰을 안전하고 즉시 구매하는 방법

Honkai: Star Rail SP Himeko 출시일, 스킬 유출 정보 & 뽑기 가이드Honkai: Star Rail Guides Hub

Honkai: Star Rail SP Himeko 출시일, 스킬 유출 정보 & 뽑기 가이드

Genshin Impact 6.7: 최고의 혼합 배너 뽑기, Sandrone V3 상향 및 3차 캐릭터 유출 정보Genshin Impact Guides Hub

Genshin Impact 6.7: 최고의 혼합 배너 뽑기, Sandrone V3 상향 및 3차 캐릭터 유출 정보

Love and Deepspace Beginner Guide: Combat, Gacha, Dating System, Card Progression, F2P Tips + topuplist Top‑Up OptionLove and Deepspace Guides Hub

Love and Deepspace Beginner Guide: Combat, Gacha, Dating System, Card Progression, F2P Tips + topuplist Top‑Up Option