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

Poppo Live và Bigo Live: Ứng dụng phát trực tiếp nào tốt hơn?Article

Poppo Live và Bigo Live: Ứng dụng phát trực tiếp nào tốt hơn?

Tiền tệ trong Punishing: Gray Raven: Rainbow Cards so với Black Cards so với Vé R&DArticle

Tiền tệ trong Punishing: Gray Raven: Rainbow Cards so với Black Cards so với Vé R&D

5 trung tâm nạp Poppo Live Coins tốt nhất: Nơi nhận ưu đãi hấp dẫn nhất và nạp an toànArticle

5 trung tâm nạp Poppo Live Coins tốt nhất: Nơi nhận ưu đãi hấp dẫn nhất và nạp an toàn

Cách gỡ cài đặt Wuthering Waves mà không bỏ sót các tệp ẩnWuthering Waves Guides Hub

Cách gỡ cài đặt Wuthering Waves mà không bỏ sót các tệp ẩn

Genshin Impact Mobile nặng bao nhiêu GB? Những cửa hàng ứng dụng sẽ không hiển thị điều gìGenshin Impact Guides Hub

Genshin Impact Mobile nặng bao nhiêu GB? Những cửa hàng ứng dụng sẽ không hiển thị điều gì

Cách mua Kim Cương Douyin ngoài Trung Quốc (Hướng dẫn 2026): Thanh toán bằng GCash, PIX, Apple Pay và nhiều phương thức khácLive Streaming Hub

Cách mua Kim Cương Douyin ngoài Trung Quốc (Hướng dẫn 2026): Thanh toán bằng GCash, PIX, Apple Pay và nhiều phương thức khác