Composite API

resp, err := client.Composite().Execute(ctx, composite.Request{
    AllOrNone: true,  // Rollback all if any fails
    CompositeRequest: []composite.Subrequest{
        {
            Method:      "POST",
            URL:         "/services/data/v59.0/sobjects/Account",
            ReferenceId: "newAccount",
            Body:        map[string]interface{}{"Name": "New Account"},
        },
        {
            Method:      "POST",
            URL:         "/services/data/v59.0/sobjects/Contact",
            ReferenceId: "newContact",
            Body: map[string]interface{}{
                "LastName":  "Smith",
                "AccountId": "@{newAccount.id}",  // Reference previous result
            },
        },
    },
})

for _, result := range resp.CompositeResponse {
    fmt.Printf("%s: %d\n", result.ReferenceId, result.HTTPStatusCode)
}

resp, err := client.Composite().CreateTree(ctx, "Account", composite.TreeRequest{
    Records: []composite.TreeRecord{
        {
            Attributes:  composite.RecordAttributes{Type: "Account", ReferenceId: "acc1"},
            Name:        "Parent Account",
            Contacts: &composite.RelatedRecords{
                Records: []interface{}{
                    map[string]interface{}{
                        "attributes": map[string]string{"type": "Contact", "referenceId": "cont1"},
                        "LastName":   "Smith",
                    },
                },
            },
        },
    },
})

resp, err := client.Composite().ExecuteGraph(ctx, composite.GraphRequest{
    Graphs: []composite.Graph{
        {
            GraphId: "graph1",
            CompositeRequest: []composite.Subrequest{
                {Method: "POST", URL: "/sobjects/Account", ReferenceId: "newAcc",
                 Body: map[string]interface{}{"Name": "Graph Account"}},
            },
        },
    },
})

// Create multiple records at once
results, err := client.Composite().CreateCollection(ctx, composite.CollectionRequest{
    AllOrNone: false,
    Records: []map[string]interface{}{
        {"attributes": map[string]string{"type": "Account"}, "Name": "Account 1"},
        {"attributes": map[string]string{"type": "Account"}, "Name": "Account 2"},
    },
})

// Update multiple records
results, _ := client.Composite().UpdateCollection(ctx, req)

// Delete multiple records
results, _ := client.Composite().DeleteCollection(ctx, []string{id1, id2, id3})

resp, err := client.Composite().ExecuteBatch(ctx, composite.BatchRequest{
    HaltOnError: false,
    BatchRequests: []composite.BatchSubrequest{
        {Method: "GET", URL: "v59.0/sobjects/Account/001xx000"},
        {Method: "GET", URL: "v59.0/sobjects/Contact/003xx000"},
    },
})