Added more docs

Author: TriPSs

spec/code_samples/PHP/sales_invoices/post.php

@@ -28,5 +28,9 @@
 
 $nInvoice->addContact($contact);
 
+// OR
+
+$nInvoice->addContact("12345678");
+
 // Create the invoice
 $moneybirdInvoice = $moneybirdClient->salesInvoices->create($nInvoice)

spec/code_samples/PHP/sales_invoices@{id}/get.php

@@ -0,0 +1,2 @@
+// Get one
+$moneybirdClient->salesInvoices->get("invoice ID");

spec/code_samples/PHP/sales_invoices@{id}@register_payment/patch.php

@@ -0,0 +1,8 @@
+// Create Payment
+$moneybirdPayment = new MoneybirdPayment();
+$moneybirdPayment->price = 200;
+$moneybirdPayment->payment_date = date("Y-m-d");
+
+// Register the Payment
+$moneybirdClient->salesInvoices->setPayment($moneybirdPayment)
+                ->registerPayment("invoice ID" || $invoice);

spec/definitions/Payment.yaml

@@ -0,0 +1,45 @@
+type: object
+properties:
+  id:
+    type: integer
+
+  administration_id:
+    type: integer
+
+  invoice_type:
+    type: string
+
+  invoice_id:
+    type: string
+
+  financial_account_id:
+    type: string
+
+  user_id:
+    type: string
+
+  payment_transaction_id:
+    type: string
+
+  price:
+    type: string
+
+  price_base:
+    type: string
+
+  payment_date:
+    type: string
+
+  credit_invoice_id:
+    type: string
+
+  financial_mutation_id:
+    type: string
+
+  created_at:
+    type: dateTime
+    example: 2017-02-21T17:04:41.056Z
+
+  updated_at:
+    type: dateTime
+    example: 2017-02-21T17:04:41.056Z

spec/definitions/SalesInvoice.yaml

@@ -89,6 +89,8 @@ properties:
 
   payments:
     type: array
+    items:
+      $ref: '#/definitions/Payment'
 
   total_paid:
     type: float

spec/paths/sales_invoices@{id}.yaml

@@ -0,0 +1,16 @@
+get:
+  tags:
+    - Sales Invoices
+  summary: Sales Invoice
+  description: |
+    [Official docs](https://developer.moneybird.com/api/sales_invoices/#get_sales_invoices_id)
+  operationId: getSalesInvoice
+
+  responses:
+    200:
+      description: Request was successful
+      schema:
+        $ref: '#/definitions/SalesInvoice'
+
+    404:
+      description: Entity not found

spec/paths/sales_invoices@{id}@register_payment.yaml

@@ -0,0 +1,16 @@
+patch:
+  tags:
+    - Sales Invoices
+  summary: Register payment
+  description: |
+    [Official docs](https://developer.moneybird.com/api/sales_invoices/#patch_sales_invoices_id_register_payment)
+  operationId: registerPayment
+
+  responses:
+    200:
+      description: Request was successful
+      schema:
+        $ref: '#/definitions/SalesInvoice'
+
+    404:
+      description: Entity not found