They may be using something like Sift for security checking and something of yours was flagged. Source: over 1 year ago

But sorry to break it to you, this has been done at a really large scale already although most consumers are not aware. One big player here is https://sift.com/ Almost every major retailer uses their service exactly for the reasons you mention. Source: almost 3 years ago

Reddit, for one. A pretty big list on their homepage. Source: almost 3 years ago

Paystack Account: Create an account on Paystack and obtain your API keys. These keys are essential for authenticating your requests with the Paystack API. - Source: dev.to / 7 months ago

Paystack is a popular payment processing platform used by businesses and individuals in Nigeria and other African countries. One of the key features of Paystack is its ability to process transactions using webhooks. Webhooks are HTTP callbacks that enable the automatic transfer of transaction data from Paystack to your application in real-time. Webhooks are useful for a variety of reasons. They can automate tasks... - Source: dev.to / about 1 year ago

Instead of creating test cases or managing exceptions, we will concentrate mostly on using the Paystack API to collect payments. Simply create an account on the Paystack website. - Source: dev.to / about 1 year ago

In this tutorial, you will learn how to build a complete food ecommerce restaurant using Medusa ecommerce engine with Paystack integration. - Source: dev.to / over 1 year ago

Paystack allows African businesses to accept payments in local and foreign currencies from multiple local and global payment channels. - Source: dev.to / over 1 year ago