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Adding a provider

Developer reference: This section is for PHP developers shipping a custom booking integration alongside Booking Engine Connector.

The plugin resolves integrations through ProviderInterface (includes/Providers/Contracts/ProviderInterface.php). The bundled KrossProvider is the reference implementation.

High-level checklist​

  1. Implement ProviderInterface in your own PHP class (Composer autoload or manual require inside a small bootstrap plugin).
  2. Register the admin label map via bec_registered_providers so Booking Engine → Connection shows your slug.
  3. Return your concrete instance from bec_provider_instance when WordPress asks for your slug—ProviderRegistry::getProvider() invokes this filter before falling back to built-ins.
  4. Store credential fields declaratively via getCredentialSchema() — Connection saves options as bec_{slug}_{fieldKey} automatically.
  5. Implement fetchRemoteUnits(), extractCoreUnitFields(), getQuoteForUnit(), buildCheckoutUrl(), and optionally BulkQuoteProviderInterface + getUnitInfoRenderers().

Admin registration​

Filter bec_registered_providers receives [ slug => human label ]. Merge your slug:

add_filter('bec_registered_providers', function (array $map): array {
    $map['myengine'] = __('My Engine', 'my-plugin');
    return $map;
});

If the saved active slug is missing from this map after filtering, Connection resets selection to kross — always merge both keys during rollout migrations.

Concrete provider instance​

Filter bec_provider_instance receives (null|ProviderInterface $maybe, string $slug):

add_filter('bec_provider_instance', function ($provider, string $slug) {
    if ($slug === 'myengine') {
        return new MyEngineProvider();
    }
    return $provider;
}, 10, 2);

Without this hook, unknown slugs currently fall back to KrossProvider inside ProviderRegistry::getProvider(), which would break unrelated integrations—always pair new slugs with this filter.

Credential schema​

Implement getCredentialSchema(): array returning a list of CredentialField objects describing admin inputs (label, help, type, required, etc.). Validate connectivity inside validateCredentials() so Sync surfaces actionable errors early.

Core responsibilities​

MethodResponsibility
getSlug()Stable lowercase slug (myengine). Must match map/filter keys.
fetchRemoteUnits()Return normalised arrays consumed by sync (external_id, nested raw payload, …). Apply filters already documented in Sync hooks where relevant.
extractCoreUnitFields()Populate CoreUnitSemantic keys (bec_core_*).
getUnitSyncFieldDefinitions()Optional extra meta definitions (UnitSyncFieldDefinition). Return [] if unused.
requiresChildrenAges() / getSearchGuestFieldMode()Drive [bec_search] field wiring (SearchGuestFieldMode).
getQuoteForUnit()Return arrays/WP_Error consistent with quote consumers (QuoteService).
buildCheckoutUrl()Return ['url' => ..., 'label' => ...] or POST descriptor (method=post, post_fields).
getUnitInfoRenderers()Map shortcode keys → callables for [bec_unit_info] (may return []).

Optional BulkQuoteProviderInterface batches availability once per SearchContext (see interface docblocks under includes/Providers/Contracts/BulkQuoteProviderInterface.php).

Units remember their provider slug​

Each bec_unit stores bec_provider_slug. Quotes/checkout resolve via that slug even if the global active provider changes—keep slug constants backward compatible when renaming integrations.

Testing hooks​

Use bec_test_connection from Connection page verify button for non-Kross adapters (return friendly strings/WP_Error). Kross wires token exchange automatically.