New SEPA Direct Debit integration (3698)

[Dinamiko]

Implement SEPA direct debit.

SEPA direct debit features

• Supported transaction types: One-off or Recurring Payments.
• Settlement: Instant or Delayed.
• Vaulting: Supported
• Transaction Currency: EUR only
• Refunds: Full, Partial and Multiple Partial refunds supported.
• Integration Type: PayPal Orders v2 API and Braintree SDKs.

SEPA Direct Debit allows you to access funds immediately if you opt for Instant Settlements. Delayed settlement option will make funds available in the standard SEPA settlement timeframe of 2-3 days.

[Narek13]

I would suggest to always add typehints since we are already on PHP 7.4 +

Suggested change

	private $orders_endpoint;
	private Orders $orders_endpoint;

[stracker-phil]

I agree with this suggestion; when possible, we should use the type hints.

Just want to point out that this is only possible for custom properties, and we cannot add a type hint for properties that are defined without a type in the base class

[Narek13]

Suggested change

	const ID = 'ppcp-sepa';
	public const ID = 'ppcp-sepa';

[Narek13]

Same here, missing typehints for the class

[github-actions]

Test using WordPress Playground

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What's included:

• ✅ WordPress (latest)
• ✅ WooCommerce (latest)
• ✅ PayPal Payments plugin v3.0.9-pr2855-17377414652-g7a6b72c (built from this PR)

Login credentials:

• Username: admin
• Password: password

Plugin Details:

• Version: 3.0.9-pr2855-17377414652-g7a6b72c
• Commit: 7a6b72c
• Artifact: woocommerce-paypal-payments-3.0.9-pr2855-17377414652-g7a6b72c

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