Go SDK

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package main
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import (
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	"os"
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	usgm "github.com/usgm/usgm-go"
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	usgmclient "github.com/usgm/usgm-go/client"
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	"github.com/usgm/usgm-go/option"
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)
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func main() {
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	client := usgmclient.NewClient(
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		option.WithApiKey(os.Getenv("USGM_API_KEY")), // never hard-code the key
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	)
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	_ = client
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}

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ctx := context.Background()
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// List mail
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page, err := client.Mails.List(ctx, &usgm.MailsListRequest{IsRead: usgm.Bool(false)})
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if err != nil {
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	return err
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}
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for _, mail := range page.Data {
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	fmt.Println(mail.Id, mail.Sender)
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}
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// Fetch one item
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mail, err := client.Mails.Get(ctx, "80421")
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// Mark it read
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_, err = client.Mails.Update(ctx, "80421", &usgm.UpdateMailRequest{IsRead: usgm.Bool(true)})

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mail, err := client.Mails.Get(ctx, "does-not-exist")
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if err != nil {
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	var apiErr *usgm.Error
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	if errors.As(err, &apiErr) {
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		log.Printf("%s %d %s", apiErr.Code, apiErr.StatusCode, apiErr.RequestId)
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	}
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	return err
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}