Start a subscription

curl -X POST https://api.einvoicing.dev/v1/billing/checkout-sessions \  -H "Authorization: Bearer $EINVOICING_API_KEY" \  -H "Content-Type: application/json" \  -d '{ "plan": "developer" }'

<?php$client = new GuzzleHttp\Client();$response = $client->request('POST', 'https://api.einvoicing.dev/v1/billing/checkout-sessions', [    'headers' => [        'Authorization' => 'Bearer ' . getenv('EINVOICING_API_KEY'),        'Accept' => 'application/json',    ],    'json' => [        'plan' => 'developer',    ],]);$data = json_decode((string) $response->getBody(), true)['data'];

payload := `{  "plan": "developer"}`req, _ := http.NewRequest(http.MethodPost, "https://api.einvoicing.dev/v1/billing/checkout-sessions", strings.NewReader(payload))req.Header.Set("Authorization", "Bearer "+os.Getenv("EINVOICING_API_KEY"))req.Header.Set("Content-Type", "application/json")res, err := http.DefaultClient.Do(req)if err != nil {	log.Fatal(err)}defer res.Body.Close()

const res = await fetch("https://api.einvoicing.dev/v1/billing/checkout-sessions", {  method: "POST",  headers: {    Authorization: `Bearer ${process.env.EINVOICING_API_KEY}`,    "Content-Type": "application/json",  },  body: JSON.stringify({    "plan": "developer"  }),});const { data } = await res.json();