The PayLah! APIs enables Partners (Merchants) to perform payment request for online checkout, transaction inquiry, refund etc. The documentation showcases all available endpoints and operations for the PayLah! API.
You must register for a developer account with DBS (free of charge) to access the documentation. The API is very well documented.
DBS (The Development Bank of Singapore Limited | DBS Group) is a leading financial services group in Asia. They are headquartered in Singapore, with a growing presence in Greater China, Southeast Asia and South Asia.