invoiceninja-sdk/COVERAGE.md

API coverage

What this crate wraps of the Invoice Ninja v5 API, and what it doesn't.

Full coverage is a stated goal, so the gaps below are a to-do list rather than a permanent boundary — GOALS.md puts them in rough priority order.

Checked against routes/api.php on the v5-stable branch of the invoiceninja repo, which declares 34 Route::resource groups and 274 explicit route declarations (272 single-verb, plus two Route::match pairs registering two verbs each).

Note on sources: Invoice Ninja's published openapi/api-docs.yaml is reliable for schemas but incomplete for routes — it documents /{id} and action paths only for clients, locations, and tags. Use routes/api.php and the controllers when checking whether an endpoint exists or what it returns.

All 34 Route::resource groups are now wrapped, plus users (which is not a resource group). 371 methods in total.

Resources with full CRUD + bulk

30 resources, each with list_*, list_all_*, get_*, create_*, update_*, delete_*, and bulk_*:

Resource	Path	Model
Clients	/clients	Client (+ ClientContact)
Invoices	/invoices	Invoice (+ InvoiceItem)
Quotes	/quotes	Quote (alias of Invoice)
Credits	/credits	Credit (alias of Invoice)
Payments	/payments	Payment (+ PaymentInvoice)
Products	/products	Product
Purchase Orders	/purchase_orders	PurchaseOrder
Recurring Invoices	/recurring_invoices	RecurringInvoice
Recurring Quotes	/recurring_quotes	RecurringQuote (alias of RecurringInvoice)
Recurring Expenses	/recurring_expenses	RecurringExpense
Subscriptions	/subscriptions	Subscription
Projects	/projects	Project
Tasks	/tasks	Task
Task Statuses	/task_statuses	TaskStatus
Expenses	/expenses	Expense
Expense Categories	/expense_categories	ExpenseCategory
Vendors	/vendors	Vendor (+ VendorContact)
Bank Transactions	/bank_transactions	BankTransaction
Tax Rates	/tax_rates	TaxRate
Payment Terms	/payment_terms	PaymentTerm
Webhooks	/webhooks	Webhook
Bank Integrations	/bank_integrations	BankIntegration
Bank Transaction Rules	/bank_transaction_rules	BankTransactionRule
Company Gateways	/company_gateways	CompanyGateway
Designs	/designs	Design
Group Settings	/group_settings	GroupSetting
Locations	/locations	Location
Tags	/tags	Tag
Task Schedulers	/task_schedulers	TaskScheduler
Tokens	/tokens	CompanyToken

create_recurring_quote currently 500s against Invoice Ninja 5.13.50: the server's own insert names a design_id column its recurring_quotes table does not have. The request is well-formed; nothing here can work around it.

bulk_* accepts any action the endpoint supports; archive, restore, and delete work on all of them. An ids list matching nothing returns an empty Vec, not an error.

Resources without a bulk route

Three Route::resource groups have no /bulk route, so they get the six CRUD methods but no bulk_* (which would just 405). These use crud_methods! rather than resource_methods!:

Resource	Path	Model
Client Gateway Tokens	/client_gateway_tokens	ClientGatewayToken
Companies	/companies	Company
System Logs	/system_logs	SystemLog

Company and GroupSetting keep their settings blob as serde_json::Value: CompanySettings is the largest object in the API, and Company itself returns over a hundred fields, so only the structural ones are modeled and extra carries the feature toggles.

Users

/users is not a Route::resource and has no DELETE /users/{id}, so it is hand-written:

Endpoint	Method	Needs password?
GET /users	list_users, list_all_users	no
GET /users/{id}	get_user	yes
POST /users	create_user	yes
PUT /users/{id}	update_user	yes
DELETE /users/{id}/detach_from_company	detach_user_from_company	yes
POST /users/bulk	bulk_users	yes

"Needs password" means the route sits behind the API's password_protected middleware and requires an X-API-PASSWORD header on top of a valid token. Supply it with InvoiceNinjaClient::with_api_password, which also unlocks client and vendor merge, and client/company/user purge. Note that even reading a single user is gated this way.

Entity actions

GET /{resource}/{id}/{action} exists for only four resources — invoices, quotes, credits, and purchase orders. Each gets {singular}_action(id, action) and download_{singular}(id).

Actions returning the entity: auto_bill, clone_to_invoice, clone_to_quote, mark_paid, mark_sent, archive, restore, delete.

Actions that do not return the entity, and so are not usable through *_action:

Action	Returns	Use instead
download	application/pdf stream	download_invoice(id) etc.
convert_to_purchase_order	a purchase order	convert_invoice_to_purchase_order(id)
cancel, history, delivery_note	empty body (upstream quirk)	— not wrapped

Each of the four also gets download_{plural}(&ids) — the bulk download action, which streams one merged PDF. It can't go through bulk_* for the same reason: the response isn't JSON.

Convenience wrappers: mark_invoice_sent and mark_invoice_paid.

Invitation-key downloads

The same four resources also answer two downloads keyed by invitation key rather than record id — the per-contact token that appears in a client-portal link. Eight routes, all wrapped:

Route	Method	Returns
GET /invoice/{key}/download	download_invoice_by_invitation_key	application/pdf
GET /invoice/{key}/download_e_invoice	download_e_invoice_by_invitation_key	application/xml
GET /quote/{key}/download	download_quote_by_invitation_key	application/pdf
GET /quote/{key}/download_e_quote	download_e_quote_by_invitation_key	application/xml
GET /credit/{key}/download	download_credit_by_invitation_key	application/pdf
GET /credit/{key}/download_e_credit	download_e_credit_by_invitation_key	application/xml
GET /purchase_order/{key}/download	download_purchase_order_by_invitation_key	application/pdf
GET /purchase_order/{key}/download_e_purchase_order	download_e_purchase_order_by_invitation_key	application/xml

Two things about these are easy to get wrong, and both are pinned by tests. The entity segment is singular — invoice/…, not invoices/… — which is the only place in the API that departs from the plural CRUD path. And despite being the download a client follows, they are authenticated: the routes sit inside routes/api.php's api/v1 group under its token_auth middleware, so they need the API token like any other call.

This file previously listed them as unwrapped on the grounds that they take no auth token. That was wrong — it conflated them with the client-portal routes in routes/client.php (/client/invoice/{key}/download_pdf and friends), which are a separate route family, are not under /api/v1, and remain unwrapped for that reason.

The smoke test's read tier exercises the invoice PDF, taking a key from the invitations array the list route already returns. The download_e_* four are not exercised: they render from the company's e-invoice settings, which a test instance need not have configured.

An unknown or deleted key is a 400 carrying no record found. The controllers return that directly rather than raising ModelNotFoundException, so the message differs from the No query results for model text a missing record produces elsewhere, but the status is the same 400.

Import and export

Route	Method	Returns
POST /export	export	ExportJob
POST /preimport	preimport	ImportPreview
POST /import	import	MessageResponse
POST /import_json	import_json	MessageResponse
PUT /edocument/upload	upload_edocument	MessageResponse

A CSV import is two calls. preimport uploads the files — one per entity type, as files[<entity_type>] — and answers with a hash plus the column mapping the server suggests; import then starts the ingest from that hash. The server holds the files against the hash for 20 minutes.

The route also accepts the files and the mapping together in one multipart request. That form is deliberately not wrapped: a mapping is a nested structure, and bracket-encoding nested structures into form fields is exactly what this crate avoids by sending JSON (see the PHP SDK comparison). With a hash present the controller never looks at uploaded files, so import is plain JSON.

upload_edocument is not a document attachment, which is why it is not one of the upload_* methods: ExpenseController::edocument parses each file and creates expenses. Like the /{id}/upload routes it is registered as PUT and so goes out as a POST with _method=PUT; unlike them the reply has no data envelope.

All five queue background work, so a 200 means accepted, not finished. Rows that fail to import are reported by email. import_json restores a company from an export backup and overwrites the target company.

E-invoicing

Seventeen routes, all wrapped. Mostly pass-throughs to Storecove, Invoice Ninja's Peppol access point, so they return serde_json::Value — see Typed response gaps for why.

Route	Method	Returns
POST /einvoice/validateEntity	validate_einvoice	Value
POST /einvoice/configurations	einvoice_configurations	Value
GET /einvoice/quota	einvoice_quota	Value
GET /einvoice/health_check	einvoice_health_check	()
GET /einvoice/delivery_map	einvoice_delivery_map	Value
POST /einvoice/token/update	update_einvoice_token	() (204)
POST /einvoice/peppol/discovery	peppol_discovery	Value
POST /einvoice/peppol/legal_entity	peppol_legal_entity	Value
POST /einvoice/peppol/setup	peppol_setup	Option<Value>
POST /einvoice/peppol/disconnect	peppol_disconnect	Value
PUT /einvoice/peppol/update	peppol_update_legal_entity	Value
POST /einvoice/peppol/add_additional_legal_identifier	peppol_add_legal_identifier	MessageResponse
DELETE /einvoice/peppol/remove_additional_legal_identifier	peppol_remove_legal_identifier	Value
POST /einvoice/peppol/send	peppol_retry_send	MessageResponse
POST /einvoice/peppol/sg/c5/activate	peppol_sg_c5_activate	MessageResponse
POST /einvoice/peppol/sg/c5/deactivate	peppol_sg_c5_deactivate	MessageResponse
POST /einvoice/peppol/sg/c5/cancel	peppol_sg_c5_cancel	MessageResponse

Three things here behave unlike the rest of the API:

• A failing check is a non-2xx. validate_einvoice answers 422 when validation finds problems, so "this invoice is not Peppol-ready" — an ordinary result — arrives as Error::Api, and the per-entity detail in the body is not reachable through the typed error. An Ok means it passed.
• Error bodies are not the usual shape. The Peppol handlers return data_get($response, 'message') as the entire body, which can be a bare string. Error::Api's message then falls back to an excerpt and errors is empty.
• peppol_setup has two success shapes. A corppass_url when the connection needs a further browser step (Singapore's CorpPass), or a bare 204 when it completed. Hence Option<Value> rather than treating the empty body as a decode failure.

peppol_remove_legal_identifier is the only DELETE in the crate that carries a request body.

Integrations

Route	Method	Returns
POST /quickbooks/sync	quickbooks_sync	() (204)
POST /quickbooks/action	quickbooks_action	() (204)
POST /quickbooks/disconnect	quickbooks_disconnect	() (204)
POST /quickbooks/reconnect_url	quickbooks_reconnect_url	Value
POST /stripe/update_payment_methods	stripe_update_payment_methods	MessageResponse
POST /stripe/import_customers	stripe_import_customers	MessageResponse
POST /stripe/verify	stripe_verify	Value
POST /stripe/disconnect/{id}	stripe_disconnect	Value
GET /calendar_connection	calendar_connection	Value
POST /calendar_connection/{provider}/complete	complete_calendar_connection	Value
GET /calendar_connection/calendars	calendar_connection_calendars	Value
GET /calendar_connection/events	calendar_connection_events	Value
PUT /calendar_connection/calendars	update_calendar_connection_calendars	Value
DELETE /calendar_connection	delete_calendar_connection	()
POST /yodlee/status/{account_number}	yodlee_account_status	Value
GET /nordigen/institutions	nordigen_institutions	Value

All four Stripe routes are password-protected — supply with_api_password — and answer 403 for a non-admin.

These operate a connection that already exists. Establishing one is a browser flow and is not wrappable: the OAuth authorize and callback legs live outside the api/v1 group, take no API token, and answer with redirects. See the gap list.

yodlee_account_status takes Yodlee's own account_id, as stored on the matching BankIntegration — not an Invoice Ninja id. Its upstream route carries a @todo questioning its own path, so treat it as liable to move. nordigen_institutions covers GoCardless, which was Nordigen when the route was named; an instance without GoCardless credentials answers 400 rather than an empty list.

Document uploads

PUT /{resource}/{id}/upload exists for 16 resources, each getting upload_{singular}(id, files, is_public) that returns the refreshed record:

Resource	Method
Clients	upload_client
Companies	upload_company
Credits	upload_credit
Expenses	upload_expense
Group Settings	upload_group_setting
Invoices	upload_invoice
Payments	upload_payment
Products	upload_product
Projects	upload_project
Purchase Orders	upload_purchase_order
Quotes	upload_quote
Recurring Expenses	upload_recurring_expense
Recurring Invoices	upload_recurring_invoice
Recurring Quotes	upload_recurring_quote
Tasks	upload_task
Vendors	upload_vendor

This is the only way the API creates a document: DocumentController::store is an empty stub upstream, so Document has list, get, update, delete, download, and bulk, but no create_document, and there will not be one.

Three details that are easy to get wrong, all verified against the upstream source rather than the published spec:

• The request is a POST carrying _method=PUT. The route is registered as PUT, but PHP does not parse a multipart body on a PUT, so the files would never arrive. Laravel's kernel turns the spoofed method back into a PUT before routing. The OpenAPI spec documents POST with _method=POST, which would 405 against these routes.
• is_public is sent as 1/0. Laravel's boolean rule accepts only true, false, 0, 1, '0', and '1' under strict comparison, so the string "true" fails validation.
• Uploads are never retried, even on a 429. An upload adds a document, so it is not idempotent whatever its verb, and a replay after a lost response would attach the file twice.

The server enforces file type and size limits; a refusal comes back as a 422 Error::Api with the per-field errors map. Files are held in memory while uploading.

Other wrapped endpoints

Endpoint	Method
GET /documents, /documents/{id}	list_documents, list_all_documents, get_document
PUT/DELETE /documents/{id}	update_document, delete_document
GET /documents/{id}/download	download_document → bytes
POST /documents/bulk	bulk_documents
POST /reports/{name}	report(name, body) → raw bytes (CSV for most)
POST /charts/{name}	chart(name, body) → caller-chosen T
POST /search	search(body)
GET /statics	statics()
POST /emails	send_email(body)
POST /payments/refund	refund_payment(body)
GET /ping	ping()
GET /health_check	health_check()

report and chart take the name as a string, so all 32 report and 11 chart endpoints are reachable without a per-endpoint method:

• Reports — activities, ar_detail_report, ar_summary_report, client_balance_report, client_contacts, client_locations, clients, client_sales_report, contacts, credits, documents, expenses, invoice_items, invoices, locations, payments, preview, products, product_sales, profitloss, projects, purchase_order_items, purchase_orders, quote_items, quotes, recurring_invoice_items, recurring_invoices, tasks, tax_period_report, tax_summary_report, user_sales_report, vendors
• Charts — totals, totals_v2, chart_summary, chart_summary_v2, calculated_fields, analytics_summary, analytics_totals, cashflow_forecast, client_payment_analytics, project_analytics, project_burnup

Three of these take a further path segment rather than carrying the id in the body: charts/project_analytics/{project}, charts/project_burnup/{project}, and reports/preview/{hash}. The name argument is interpolated as-is, so pass the whole tail — chart("project_burnup/<id>", &body).

Large report exports are queued and emailed rather than returned inline; in that case the body is a short JSON message instead of CSV.

Activities, email history and previews

Each has a response shape of its own. Marked observed where confirmed against a 5.13.50 server.

Endpoint	Method	Returns
GET /activities	list_activities, list_all_activities	Vec<Activity> (observed)
GET /activities?reactv2=1	activity_feed(rows)	Vec<ActivityFeedEntry> (observed)
POST /activities/entity	entity_activity(entity, id, rows)	Vec<ActivityFeedEntry> (observed)
POST /activities/notes	add_activity_note(entity, id, notes)	Activity (observed)
GET /activities/download_entity/{id}	download_activity_entity	PDF bytes
POST /emails/clientHistory/{client}	client_email_history	Vec<serde_json::Value>
POST /emails/entityHistory	entity_email_history	Vec<serde_json::Value>
POST /preview	preview, preview_html	PDF bytes / HTML
POST /live_preview	live_preview	PDF bytes (observed)
POST /live_design	live_design	PDF bytes
POST /preview/purchase_order	preview_purchase_order	PDF bytes
POST /live_preview/purchase_order	live_preview_purchase_order	PDF bytes

Things that are easy to get wrong:

• The entity name is singular in one route and plural in the next. entity_activity takes invoice; add_activity_note takes invoices.
• rows, not per_page, caps the activity log (default 75). Pass it through ListParams::param. entity_activity leaves rows out when not given rather than sending null, because the server tests for the key and a null would count as given and remove the cap.
• The two activity shapes differ. Activity carries hashed ids and a string activity_type_id; the feed's ActivityFeedEntry carries a numeric one and labelled references (invoice, client, … each {label, hashed_id}).
• Email history is raw JSON. The objects mirror what the mail provider reported, and the instance available had never sent mail, so there was no shape to take.
• Not yet run against a real server: preview, preview_html, and both purchase-order previews (they need a design object or a purchase order and a PDF backend), and live_design, which answered a bare minimal request with a 500 from the server on 5.13.50.

Password-protected actions

Behind the password_protected middleware, so each needs with_api_password (the server also lets a recent password-authenticated session through without the header). Most are irreversible, and all are POSTs except one, so none is retried on a 5xx.

Endpoint	Method	Returns
POST /clients/{id}/purge	purge_client	MessageResponse
POST /clients/{id}/{other}/merge	merge_clients(id, other)	the surviving Client
POST /vendors/{id}/{other}/merge	merge_vendors(id, other)	the surviving Vendor
POST /companies/purge/{id}	purge_company	MessageResponse
POST /companies/purge_save_settings/{id}	purge_company_save_settings	MessageResponse
POST /users/{id}/invite	invite_user	MessageResponse
POST /users/{id}/purge	purge_user	() (the server answers 204)
GET /users/create	new_user_template	a blank User, nothing stored

A merge keeps the first id and folds the second into it. The smoke test's optional password tier (merge two throwaway clients, purge the survivor) was run against a disposable 5.13.50 instance on 2026-10-24 and passes; it also established that a purged record reads back as a 400, not a 404. A password containing a control character cannot be a header value and goes out as X-API-PASSWORD-BASE64 instead.

Per-resource extras

Routes that sit beside a resource's CRUD set, each with its own response shape (read from the upstream controllers; the ones marked observed were also confirmed against a 5.13.50 server). All are POST unless noted, so none is retried on a 5xx or a timeout.

Endpoint	Method	Returns
POST /webhooks/{id}/retry	retry_webhook	Webhook
POST /tasks/sort	sort_tasks	MessageResponse
POST /designs/set/default	set_default_design	MessageResponse
POST /client_gateway_tokens/{id}/setAsDefault	set_default_client_gateway_token	ClientGatewayToken
GET /subscriptions/steps	subscription_steps	Vec<SubscriptionStep> (observed: an object keyed by class name, not the array the source suggests)
POST /subscriptions/steps/check	check_subscription_steps	()
POST /company_gateways/{id}/test	test_company_gateway	MessageResponse
POST /company_gateways/{id}/clone	clone_company_gateway	CompanyGateway
POST /company_gateways/{id}/import_customers	import_company_gateway_customers	MessageResponse
POST /bank_integrations/refresh_accounts	refresh_bank_accounts	() (the body is a serialised query builder)
POST /bank_integrations/remove_account/{id}	remove_bank_account	BankIntegration
POST /bank_integrations/get_transactions/{id}	fetch_bank_transactions	MessageResponse (the server ignores the id)
POST /bank_transactions/match	match_bank_transactions	Vec<BankTransaction>
POST /clients/{id}/updateTaxData	update_client_tax_data	Client
POST /clients/{id}/show_settings	client_show_settings	serde_json::Value (observed)
POST /clients/{id}/peppol_discovery	client_peppol_discovery	serde_json::Value
POST /clients/{id}/check_vat	check_client_vat	MessageResponse
GET /clients/{id}/vat_status	client_vat_status	MessageResponse (observed)
POST /clients/{id}/documents	client_documents	Vec<Document> (observed; one page)

updateTaxData and check_vat call out to external tax services, so the smoke test does not exercise them.

Not covered

Nothing is blocked on a dependency

Multipart uploads used to be, and are now wrapped — see Document uploads and Import and export.

Resource groups not wrapped

None — all 34 Route::resource groups are covered.

Adding a new one is mechanical: add a model under src/models/, re-export it from src/models/mod.rs, and add a resource_methods! invocation in src/client.rs (or crud_methods! if the resource has no /bulk route — check routes/api.php).

Individual endpoints not wrapped

• Company extras — GET /companies/{id}/logo, POST /companies/{id}/default, updateOriginTaxData, POST /companies/current
• User extras (not password-protected, unlike the rest of /users) — POST /users/{id}/disconnect_mailer, POST /users/{id}/disconnect_oauth, POST /user/{id}/reconfirm
• Auth — /login, /logout, /refresh, /connected_account, passkey routes
• Migration — /migration/start. Moves a company between instances and is driven by the v4 migration tool, not by an SDK caller.
• Invoice extras — delivery_note, payment_schedule, update_reminders
• Client-portal invitation downloads — the routes/client.php family: /client/invoice/{key}/download_pdf, the download_e_* variants for quotes and credits, /client/{entity}/{key}/download, and /client/documents/{hash}/hashed. These are not under /api/v1, so they don't fit a base_url that ends there. Note these are not the invitation-key downloads documented above, which are authenticated /api/v1 routes and are wrapped.
• Integration routes that cannot take an API token — the OAuth legs of the QuickBooks and calendar flows (/quickbooks/authorize/{token}, /quickbooks/reconnect/{token}, /quickbooks/authorized, /calendar_connection/{provider}/authorize/{hash}) and the provider webhooks (/yodlee/refresh, /yodlee/data_updates, /yodlee/refresh_updates, /yodlee/balance, /postmark_webhook, /sns_webhook, /postmark_inbound_webhook, /payment_webhook/…). The OAuth routes sit outside the api/v1 group and answer with browser redirects; the webhooks are things a provider calls, not things a client calls. Connecting an account is a browser flow — see Integrations for the methods that operate a connection once it exists.
• POST /quickbooks/settings — the route is registered, but QuickbooksController has no settings method, so it raises BadMethodCallException and 500s. Nothing to wrap until upstream adds the handler.
• Other integrations — Apple in-app purchase, PostMark, self-update, templates, hooks (commented out upstream)
• Misc — /company_users, /company_ledger, /client_statement, /claim_license, /check_license, /check_subdomain, /one_time_token, /last_error, /support/messages/send, /verify/*, /accounts/{id}, /feedback, /filters/{entity}, /scheduler, /mailer/check, /smtp/check, /password_timeout, /refresh_react, /webcron, /token_hash_router, /reactivate_email/{bounce_id}, /protected_download/{hash}, /confirm_purchase, /exports/preview/{hash}, /templates/preview/{hash}

Typed response gaps

statics, search, and health_check return concrete types (Statics, SearchResults, HealthCheck). Each keeps the crate's extra convention, so fields they don't model stay reachable rather than being dropped, and each has a generic counterpart — statics_as, search_as, health_check_as — for pinning a shape they leave untyped.

The e-invoicing and integration methods return serde_json::Value as a rule, which is the largest untyped surface in the crate and is deliberate. Their replies are pass-throughs from an external service — Storecove, Stripe's gateway driver, Yodlee, GoCardless — or arrays assembled for Invoice Ninja's own React client. None has a documented schema, several differ by provider, and they change on the provider's release schedule rather than Invoice Ninja's. The precedent is client_peppol_discovery, which has returned Value since it landed. Where a shape is stable and is the point of the call it is still typed, as with ExportJob and ImportPreview.

Two remain generic on purpose:

• chart — the eleven chart endpoints share no common response shape (totals_v2 returns per-currency maps, cashflow_forecast a date series, calculated_fields scalars), so there is nothing to narrow to.
• send_email — the endpoint serves invoices, quotes, credits, and purchase orders, and answers with whichever entity was emailed. The data envelope is unwrapped, so T is the entity itself.

Within the typed models, a few fields are deliberately left as serde_json::Value: Statics::gateways, Statics::templates, Statics::bulk_updates, HealthCheck::extensions, and HealthCheck::queue_data. These are nested configuration blobs rather than uniform lookup rows, and the same reasoning applies as for Company::settings — a wrong concrete type is a hard decode error, whereas Value is lossless.

Compared with the official PHP SDK

invoiceninja/sdk-php is the first-party wrapper. It's worth checking against, but it is deliberately thinner than this crate: every one of its endpoint classes is just a URI on top of a shared BaseEntity offering all, get, create, update, bulk, archive, delete, restore, and download. Only Companies and Statics add anything of their own.

It covers nothing we don't. The five resources it used to have on us — users, companies, group_settings, bank_integrations, client_gateway_tokens — are all wrapped now.

We cover a lot it doesn't: payment_terms, task_statuses, recurring_quotes, recurring_expenses, bank_transaction_rules, company_gateways, designs, locations, tags, task_schedulers, tokens, system_logs, documents, per-entity actions (mark_sent, mark_paid, clone_to_*, …), per-entity PDF download by id and by invitation key, the XML e-documents, reports, charts, search, send_email, refund_payment, ping, health_check, automatic pagination (list_all_*), and X-API-PASSWORD support for the password-protected routes.

Deliberate differences in behaviour:

	PHP SDK	This crate
Request bodies	form_params (urlencoded)	JSON
Base URL	host only; appends /api/v1 itself	full API root, or hosted()
Single-entity delete	none — delete() is bulk	delete_*(id) via HTTP DELETE, plus bulk_*
Validation errors	surfaces only the first message	whole per-field errors map on Error::Api
List filters	arbitrary array	typed setters plus ListParams::param

The urlencoded-vs-JSON difference is the one that matters: form encoding bracket-encodes nested structures, so a payload like an invoice's line_items array of objects is far cleaner as JSON. Both are accepted by the API.

Two things in the PHP SDK are not worth copying: it sends stream: false in download payloads, but no controller reads a stream input, and its BaseEntity::download is available on every resource even though only PDF-rendering entities support the action.