Put the credential data definitions in a central place for now (#68)

* Put the credential data definitions in a central place for now

* Some notes about region and version

* Casing

sdtask/sdtask.go

@@ -0,0 +1,31 @@
+package sdtask
+
+import (
+	"time"
+
+	"github.com/ethereum/go-ethereum/common"
+)
+
+type CredentialData struct {
+	TaskID        string    `json:"taskId"`
+	UserDeviceID  string    `json:"userDeviceId"`
+	IntegrationID string    `json:"integrationId"`
+	AccessToken   string    `json:"accessToken"`
+	Expiry        time.Time `json:"expiry"`
+	RefreshToken  string    `json:"refreshToken"`
+	// Version is an API version. Currently only used for Tesla: 1 is the old
+	// "Owner API" and 2 is the new "Fleet API".
+	Version int `json:"version,omitempty"`
+	// Region is a lowercase two-letter code for the region. Currently only used for
+	// Tesla, and can only be "na" or "eu".
+	Region          string           `json:"region,omitempty"`
+	SyntheticDevice *SyntheticDevice `json:"syntheticDevice,omitempty"`
+}
+
+type SyntheticDevice struct {
+	TokenID            int            `json:"tokenId"`
+	Address            common.Address `json:"address"`
+	IntegrationTokenID int            `json:"integrationTokenId"`
+	WalletChildNumber  int            `json:"walletChildNumber"`
+	VehicleTokenID     int            `json:"vehicleTokenId"`
+}