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This document is the official manual for WeChat’s payment APIs. As such, it is the tutorial for technical architects, R&D engineers, testing engineers and service engineers for the integrated WeChat payment system, which includes merchants' systems such as online shopping platforms, cashier systems, or automatic smart POS systems. The following topics are designed to be read in order and there are references to topics "previously seen" and topics "yet to come". These references are linked accordingly and it should generally not be a problem to read ahead on other topics.
The Payer shows their bar code or QR Code on WeChat's Quick Pay page to the Merchant to scan in order to pay directly. This mode applies to offline payment scenarios.
The Merchant generates a transaction QR Code according to the WeChat Payment Protocol and the Payer goes to "Scan QR Code" in their WeChat in order to complete payment. This mode is applicable to payments made on websites, physical stores, media advertising, or other scenarios.
In-App Web-based Payment, also called Official Account Payment. The Payer opens the Merchant's HTML5 pages on their WeChat and calls the WeChat payment module via the JSAPI interface to pay their transaction. This mode is applicable in the following scenarios:
In-App payment also refers to a mobile-based payment in which the Merchant calls the WeChat payment module by using the open SDK integrated in their mobile-based app to pay for transactions.