getProduct
----------
http meetod: GET
resurss: products/{:id}
näidis url: http://{domain}/products/{:id}?token={:token}

addProduct
----------
http meetod: POST
resurss: products/{:id}
näidis url: http://{domain}/products?token={:token}
näidis json: {name, code}

getProductList
--------------
http meetod:GET
resurss:products
näidis url: http://{domain}/products?token={:token}

getInvoice
addInvoice

getInvoiceList
--------------
http meetod: GET
resurss: invoices
näidis url: http://{domain}/invoices?token={:token}&startDate={:date}&endDate={:date}

getInvoiceProductList
---------------------
http meetod: GET
resurss: invoices/{:id}/products
näidis url: http://{domain}/invoices/{:id}/products?token={:token}

addInvoiceProduct
-----------------
http meetod: HOST
resurss: invoices/{:id}/products
näidis url: http://{domain}/invoices/{:id}/products?token={:token}