Go Requires Chilkat v11.0.0+

PayPal: Decide when to renew an access token

See more PayPal Examples

Use the UTC request time and expires_in from the token example. Renew five minutes early. This is a cache decision; a revoked token can still receive HTTP 401 before its calculated expiry.

PayPal documentation

Go

    //  Read the metadata saved by Get a sandbox access token.
    timing := chilkat.NewJsonObject()
    issued := chilkat.NewCkDateTime()
    loadedTiming := timing.LoadFile("paypal-token-timing.json")
    if loadedTiming != true {
        fmt.Println("No timing metadata. Request a token.")
        timing.DisposeJsonObject()
        issued.DisposeCkDateTime()
        return
    }

    validTimestamp := issued.SetFromTimestamp(*timing.StringOf("issued_at"))
    if validTimestamp != true {
        fmt.Println("Invalid issue time. Request a token.")
        timing.DisposeJsonObject()
        issued.DisposeCkDateTime()
        return
    }

    now := chilkat.NewCkDateTime()
    now.SetFromCurrentSystemTime()
    age := now.DiffSeconds(issued)
    lifetime := timing.IntOf("expires_in")
    if (age < 0) || (lifetime <= 300) || (age >= (lifetime - 300)) {
        fmt.Println("Request a new client-credentials token.")
        timing.DisposeJsonObject()
        issued.DisposeCkDateTime()
        now.DisposeCkDateTime()
        return
    }

    fmt.Println("Reuse the matching token from the credential store.")

    timing.DisposeJsonObject()
    issued.DisposeCkDateTime()
    now.DisposeCkDateTime()