Kitchen waste oil, if privately collected by unqualified oil vendors, can form a black industrial chain: illegal workshops dump waste water at will, polluting water and soil and blocking municipal drainage networks; inferior oils and fats processed from soil refining may flow back into restaurants, seriously threatening food safety.

To address the dual challenges of industry governance and financial-tax reconciliation, Yinlian Business has developed an integrated digital solution of “stored-value account + payment-enabled invoicing,” using payment and invoicing as its two core capabilities to connect the full compliant chain of waste oil collection.

By building a tiered payment and accounting account system, collection enterprises can top up in advance and purchase oil in a unified online manner, completely eliminating private cash transactions; every fund flow is clearly visible, and catering merchants can withdraw funds with one click and automatically reconcile accounts, with complete and traceable fund flows to meet regulatory traceability requirements.

The payment and tax service electronic invoice interface is integrated. When account funds are paid successfully, the system automatically captures transaction information and issues digital VAT invoices, eliminating the need for manual information entry. Orders, funds, and invoices are bound one to one, achieving three-in-one integration and avoiding the risk of issuing false invoices; collection enterprises can receive invoices immediately, and catering merchants do not need to manually handle invoicing, greatly reducing financial labor costs.

The solution can be connected to Chongqing's “Yukuai Ban” app. Under this model, catering enterprises only need to register on the “Catering Safety Online” platform and activate a waste oil account to conduct transactions and issue invoices with waste oil collection enterprises within the platform. During transactions, the “Catering Safety Online” platform automatically compares transaction information with the waste oil collection enterprise information of the kitchen, confirming that the information is authentic. After payment is successful, transaction information is automatically synchronized in real time to the Leqi platform, which automatically issues VAT digital invoices and transmits the invoices to the “Catering Safety Online” platform. Waste oil collection enterprises can download them on their own, with no manual input required throughout the process, realizing “payment equals invoicing.”

At present, more than 1,000 merchants have connected to the platform, jointly building a standardized and sustainable urban kitchen waste treatment ecosystem through multi-party collaboration.