Interpretation of EU PSD2 regulations：Open Banking API Interface Mandatory Requirements and Compliance Guidelines

Preface：The “open” era of financial technology

In today's rapidly developing digital economy,，The Second Edition of the Payment Services Directive (PSD2) issued by the European Union is undoubtedly one of the most landmark regulations in the global financial technology field.。It not only breaks the monopoly of traditional banks on account information，more through mandatoryOpen BankingRequire，Promoted profound changes in the entire payment ecosystem。For cross-border payment companies committed to expanding the European market、For electronic money institutions (EMIs) and fintech startups，Understand and implement the API interface requirements of PSD2，Not only the bottom line of compliance，It is also the core of building competitiveness.。

What is PSD2 and Open Banking API?

The core goal of PSD2 (Payment Services Directive 2) is to improve the security of the European payment market、Promote competition and drive financial innovation。in，The most critical measure is to force commercial banks to open their customers’ account access to third-party payment providers (TPPs)。

this means，through standardizedAPI interface，Authorized third-party institutions can obtain account information (AIS) or initiate payment instructions (PIS)。For financial institutions，this is no longer an option，It is a mandatory legal obligation。However，How to ensure data openness while，Meet stringent security and privacy compliance requirements，It has become the biggest pain point faced by enterprises。

Core Compliance Requirements of PSD2：Key elements of API interface

1. Strong customer authentication (SCA)

SCA is the cornerstone of the PSD2 security framework。All electronic payment transactions initiated via API，Multi-factor authentication required。This requires that the system must incorporate at least "knowledge" (such as passwords)、"Hold" (such as a mobile phone) and "Inherent" (such as a fingerprint、facial recognition) two of these three elements。When companies develop API interfaces，Must ensure that its certification process fully complies with regulatory standards，Otherwise you will face heavy fines。

2. dynamic link (Dynamic Linking)

For remote payment，PSD2 requires that the payment amount and payee must be "dynamically linked" to the authentication code。This means that if the transaction amount or payee changes，The verification code will expire immediately。This design effectively prevents man-in-the-middle attacks，It is a compliance function that must be included in the API architecture.。

3. Common and standardized API specifications

To ensure interoperability between different banks and third-party institutions，APIs must follow industry standards (such as Berlin Group standards or STET standards)。Hong Kong Huitong discovered when assisting customers in arranging cross-border payment licenses，Many companies are incompatible with API interface protocols，causing audit failure。therefore，It is crucial to choose a mature compliance consulting service provider for architecture design。

Compliance Practices：How do companies respond to regulatory challenges?

For payments businesses operating in Europe，The implementation of PSD2 is often accompanied by complex compliance costs。The Hong Kong Huitong team consists of formerHong Kong Customs and Excise DepartmentRegulatory Officer、forwardSecurities Regulatory Commission(SFC)Senior Manager and InternationalAnti-money launderingDivision (CAMS) composition，We have summarized the compliance paths below：

• Due Diligence and Risk Assessment：Before accessing the API，Data flows must be subject to a comprehensive anti-money laundering (AML) risk assessment，Ensure the qualifications and compliance of third-party institutions。
• Offshore structure and license layout：If your business involves linkage between the EU and Hong Kong/Canada, etc.，Building a robust offshore structure is an effective way to avoid the risk of regulatory overlap.。
• Ongoing compliance monitoring：Regulatory requirements are not set in stone。Enterprises need to establish internal compliance monitoring systems，real time trackingFATFand the latest guidance from EU regulators。

Hong Kong Huitong：Your professional partner on the road to global compliance

In a complex financial regulatory environment，Working alone often pays a heavy price due to neglect of details.。Hong Kong HuitongAs a professional service provider deeply involved in the field of financial compliance，We are not only proficient in Hong Kong MSO、Application for Canadian MSB and other licenses，He also has a solid background in assisting companies in interpreting EU PSD2 and other international regulations.。

Our team can provide you with：

• “Turnkey” Compliance Solutions：From offshore company structure establishment to license application，Then to compliance API technical standards consultation，We provide one-stop support。
• Accurate regulatory interpretation：Relying on the background of senior experts，We can break down obscure regulatory provisions for you，Transform into implementable business execution strategies。
• Confidentiality and rapid response：We are well aware of the extremely high requirements financial institutions have for information security.，All consultation processes are strictly confidential，Keep your trade secrets safe。

in conclusion

The era of open banking under EU PSD2 regulations is irreversible。For payment companies，APIs are no longer just technical interfaces，It is the lifeline of business compliance and growth。Through scientific architecture design and strict compliance audit，Companies can not only successfully cross regulatory thresholds，Can take advantage of open banking，Take the lead in global financial markets。

If you are in cross-border payment compliance、Any questions about licensing application or offshore structuring?，Feel free to contact us at any timeHong Kong Huitong。We will rely on our professional background and rich practical experience，Provide you with tailor-made solutions。

FAQ (FAQ)

Q1: Why does my cross-border payment business need to comply with PSD2 standards?

answer：As long as your business involves payment services within the EU，No matter where your company is registered，All must comply with the security and API access requirements of PSD2，Otherwise, it will be impossible to establish a stable settlement channel with local banks.。

Q2: How does Hong Kong Huitong help enterprises meet API compliance?

answer：We conduct compliance audits of your business processes，Help you connect with standardized API technical specifications，and make sure you are in KYC、Anti-money laundering and data security compliance levels are in line with EU regulators’ expectations。

Q3: In addition to license application，What other services does Hong Kong Huitong provide?

answer：Our services include offshore company registration、Bank account opening guide、Comprehensive services including anti-money laundering strategy development and regulatory compliance consulting，Designed to help companies effectively break through in the world's stringent regulatory environment。