$ npm i egg-passport-amazon-sp-oauth2 --save
// {app_root}/config/plugin.js
exports.passportAmazonSpOauth2 = {
enable: true,
package: 'egg-passport-amazon-sp-oauth2',
};
// {app_root}/config/config.default.js
exports.passportAmazonSpOauth2 = {
};
see config/config.default.js for more detail.
Please open an issue here.