Invoicing: docs.google.com/document/d/18YaYbAwHo5jKCx88ox3okj1RJqcPF_2gSDdzpK2XHDI/pub?embedded=true Recurrent: docs.google.com/document/d/1_1HponT9Xv5dJ10Lqh23JyNGhqhNq9myb4xXl-gUOCI/pub?embedded=true
Classes: Client