2.0.0 Release (#58)

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* add changelog

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Co-authored-by: PayPalServerSDKs <server-sdks@paypal.com>

doc/models/subscription-payment-source.md

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+
+# Subscription Payment Source
+
+The payment source definition. To be eligible to create subscription using debit or credit card, you will need to sign up here (https://www.paypal.com/bizsignup/entry/product/ppcp). Please note, its available only for non-3DS cards and for merchants in US and AU regions.
+
+## Structure
+
+`SubscriptionPaymentSource`
+
+## Fields
+
+| Name | Type | Tags | Description | Getter | Setter |
+|  --- | --- | --- | --- | --- | --- |
+| `card` | [`?SubscriptionCardRequest`](../../doc/models/subscription-card-request.md) | Optional | The payment card to use to fund a payment. Can be a credit or debit card. | getCard(): ?SubscriptionCardRequest | setCard(?SubscriptionCardRequest card): void |
+
+## Example (as JSON)
+
+```json
+{
+  "card": {
+    "name": "name6",
+    "number": "number6",
+    "expiry": "expiry4",
+    "security_code": "security_code8",
+    "type": "UNKNOWN"
+  }
+}
+```
+