System and method for providing merchant in-context checkout

A non-transitory machine-readable medium having stored thereon machine-readable instructions executable to cause performance of operations comprising:

• receiving, from an application of a computing device, a signature, a verifier, and a device token;
• validating the signature, the verifier, and the device token;
• providing, upon validating the signature, the verifier, and the device token using the public key, an access token to the application;
• receiving, from the application, the device token with a payment call;
• confirming the payment call based on the received the device token;
• and
• providing, upon executing the payment call, a confirmation to the application.

A method comprising:

• authenticating an access to a user account associated with a computing device based on credentials received from a first application running on the computing device;
• providing, in response to authenticating the access, an access token to the first application;
• receiving, from the first application, the access token and a public key associated with the user account from the first application;
• linking the public key and an authentication code to the user account;
• providing, to the first application, the authentication code;
• receiving, from a second application running on the computing device, the authentication code, a signature, and a verifier;
• providing, upon validating the authentication code, the signature, and the verifier, a device token associated with the computing device to the second application based on the validating, wherein the device token comprises data exchangeable by the second application for making payment calls from the second application