Principal

Original sum invested/lent.

Educational content only. This page does not provide investment, legal, or regulatory advice.

Why it matters

Principal matters because it affects financial interpretation, product decisions, and industry communication.

Principal is commonly explained through its core definition and the practical example used in the glossary.

A common mistake is to use Principal without understanding its operational and regulatory context.

Principal may vary across payment rails, regulations, and market practices.

Acquirer

Bank processing payments for merchant.

Algorithmic Trading

Trading using automated algorithms.

AML

Anti Money Laundering.

Anti Money Laundering

Laws against clean dirty money.

Arbitrage

Profiting from price differences in markets.

Chargeback

Reversal of a card payment.

Google Search Central

Google Search Central: Helpful, reliable, people-first content

Defines trust, helpfulness, and people-first expectations for YMYL-adjacent content.

Google Search Central

Google Search Central: Title links best practices

Supports title hygiene and metadata governance.

Adyen

Adyen: Payment methods glossary

Reference source for payments terminology clusters.

Author

Founder and multilingual fintech glossary editor

Reviewer

Editorial and source review layer

Reviewed

3/15/2026