diff --git a/CHANGELOG.md b/CHANGELOG.md
index 41a1b2a..77d1dcb 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,6 +6,9 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 
 ## [Unreleased]
 
+### Added
+* Allow using a license key instead of an API key ([#77](https://github.com/newrelic/newrelic-telemetry-sdk-go/pull/77))
+
 ## [0.8.1] - 2021-07-29
 
 ### Added
diff --git a/README.md b/README.md
index a8bff49..551eaec 100644
--- a/README.md
+++ b/README.md
@@ -51,8 +51,8 @@ import (
 )
 
 func main() {
-	// First create a Harvester.  APIKey is the only required field.
-	h, err := telemetry.NewHarvester(telemetry.ConfigAPIKey(os.Getenv("NEW_RELIC_LICENSE_KEY")))
+	// First create a Harvester.  Either License or APIKey must be provided.
+	h, err := telemetry.NewHarvester(telemetry.ConfigLicense(os.Getenv("NEW_RELIC_LICENSE_KEY")))
 	if err != nil {
 		fmt.Println(err)
 	}
diff --git a/telemetry/config.go b/telemetry/config.go
index 56c8ce1..999b471 100644
--- a/telemetry/config.go
+++ b/telemetry/config.go
@@ -13,8 +13,12 @@ import (
 
 // Config customizes the behavior of a Harvester.
 type Config struct {
-	// APIKey is required and refers to your New Relic Insert API key.
+	// APIKey refers to your New Relic Insert API key.
+	// One of APIKey or License is required
 	APIKey string
+	// License refers to your New Relic License key.
+	// One of APIKey or License is required
+	License string
 	// Client is the http.Client used for making requests.
 	Client *http.Client
 	// HarvestTimeout is the total amount of time including retries that the
@@ -55,7 +59,7 @@ type Config struct {
 	ProductVersion string
 }
 
-// ConfigAPIKey sets the Config's APIKey which is required and refers to your
+// ConfigAPIKey sets the Config's APIKey which refers to your
 // New Relic Insert API key.
 func ConfigAPIKey(key string) func(*Config) {
 	return func(cfg *Config) {
@@ -63,6 +67,14 @@ func ConfigAPIKey(key string) func(*Config) {
 	}
 }
 
+// ConfigLicense sets the Config's License which refers to your
+// New Relic License key.
+func ConfigLicense(license string) func(*Config) {
+	return func(cfg *Config) {
+		cfg.License = license
+	}
+}
+
 // ConfigCommonAttributes adds the given attributes to the Config's
 // CommonAttributes.
 func ConfigCommonAttributes(attributes map[string]interface{}) func(*Config) {
diff --git a/telemetry/harvester.go b/telemetry/harvester.go
index 5e81ad9..13bf33e 100644
--- a/telemetry/harvester.go
+++ b/telemetry/harvester.go
@@ -51,7 +51,7 @@ const (
 )
 
 var (
-	errAPIKeyUnset = errors.New("APIKey is required")
+	errAPIKeyUnset = errors.New("APIKey or License is required")
 )
 
 // NewHarvester creates a new harvester.
@@ -65,7 +65,12 @@ func NewHarvester(options ...func(*Config)) (*Harvester, error) {
 		opt(&cfg)
 	}
 
-	if cfg.APIKey == "" {
+	var apiKeyOption ClientOption
+	if cfg.APIKey != "" {
+		apiKeyOption = WithInsertKey(cfg.APIKey)
+	} else if cfg.License != "" {
+		apiKeyOption = WithLicenseKey(cfg.License)
+	} else {
 		return nil, errAPIKeyUnset
 	}
 
@@ -97,7 +102,7 @@ func NewHarvester(options ...func(*Config)) (*Harvester, error) {
 	userAgent := "harvester " + h.config.userAgent()
 
 	h.spanRequestFactory, err = NewSpanRequestFactory(
-		WithInsertKey(h.config.APIKey),
+		apiKeyOption,
 		withScheme(spanURL.Scheme),
 		WithEndpoint(spanURL.Host),
 		WithUserAgent(userAgent),
@@ -112,7 +117,7 @@ func NewHarvester(options ...func(*Config)) (*Harvester, error) {
 	}
 
 	h.metricRequestFactory, err = NewMetricRequestFactory(
-		WithInsertKey(h.config.APIKey),
+		apiKeyOption,
 		withScheme(metricURL.Scheme),
 		WithEndpoint(metricURL.Host),
 		WithUserAgent(userAgent),
@@ -127,7 +132,7 @@ func NewHarvester(options ...func(*Config)) (*Harvester, error) {
 	}
 
 	h.eventRequestFactory, err = NewEventRequestFactory(
-		WithInsertKey(h.config.APIKey),
+		apiKeyOption,
 		withScheme(eventURL.Scheme),
 		WithEndpoint(eventURL.Host),
 		WithUserAgent(userAgent),
@@ -142,7 +147,7 @@ func NewHarvester(options ...func(*Config)) (*Harvester, error) {
 	}
 
 	h.logRequestFactory, err = NewLogRequestFactory(
-		WithInsertKey(h.config.APIKey),
+		apiKeyOption,
 		withScheme(logURL.Scheme),
 		WithEndpoint(logURL.Host),
 		WithUserAgent(userAgent),
@@ -153,7 +158,8 @@ func NewHarvester(options ...func(*Config)) (*Harvester, error) {
 
 	h.config.logDebug(map[string]interface{}{
 		"event":                  "harvester created",
-		"api-key":                sanitizeAPIKeyForLogging(h.config.APIKey),
+		"api-key":                sanitizeKeyForLogging(h.config.APIKey),
+		"license-key":            sanitizeKeyForLogging(h.config.License),
 		"harvest-period-seconds": h.config.HarvestPeriod.Seconds(),
 		"metrics-url-override":   h.config.MetricsURLOverride,
 		"spans-url-override":     h.config.SpansURLOverride,
@@ -169,7 +175,7 @@ func NewHarvester(options ...func(*Config)) (*Harvester, error) {
 	return h, nil
 }
 
-func sanitizeAPIKeyForLogging(apiKey string) string {
+func sanitizeKeyForLogging(apiKey string) string {
 	if len(apiKey) <= 8 {
 		return apiKey
 	}
diff --git a/telemetry/harvester_test.go b/telemetry/harvester_test.go
index 6a599ff..9cba12c 100644
--- a/telemetry/harvester_test.go
+++ b/telemetry/harvester_test.go
@@ -135,11 +135,11 @@ func TestSanitizeApiKeyForLogging(t *testing.T) {
 			t.Errorf("Got %s but expected %s", actual, expected)
 		}
 	}
-	assertEqual("", sanitizeAPIKeyForLogging(""))
-	assertEqual("", sanitizeAPIKeyForLogging(""))
-	assertEqual("foo", sanitizeAPIKeyForLogging("foo"))
-	assertEqual("foobarba", sanitizeAPIKeyForLogging("foobarbazqux"))
-	assertEqual("eu01xxfoobarba", sanitizeAPIKeyForLogging("eu01xxfoobarbazqux"))
+	assertEqual("", sanitizeKeyForLogging(""))
+	assertEqual("", sanitizeKeyForLogging(""))
+	assertEqual("foo", sanitizeKeyForLogging("foo"))
+	assertEqual("foobarba", sanitizeKeyForLogging("foobarbazqux"))
+	assertEqual("eu01xxfoobarba", sanitizeKeyForLogging("eu01xxfoobarbazqux"))
 }
 
 func TestHarvesterRecordSpan(t *testing.T) {