WP Simple Pay: Per-Form Fixed Tax Rate Percentages

/**

 * @link https://library.wpcode.com/snippet/924rp65g/

 * 

 * @param int $percentage Tax rate percentage.

 * @param \SimplePay\Pro\Taxes\TaxRate[] $tax_rates Tax Rates

 */

function simpay_find_tax_rate( $percentage, $tax_rates ) {

	return array_values(

		array_filter(

			$tax_rates,

			function ( $tax_rate ) use ( $percentage ) {

				return $tax_rate->percentage == $percentage;

			}

		)

	);

}

add_filter(

	'simpay_get_payment_form_tax_rates',

	/**

	 * Filters the tax rates for a given form.

	 * 

	 * @param \SimplePay\Pro\Taxes\TaxRate[] $tax_rates Tax Rates

	 * @param \SimplePay\Core\Abstracts\Form $form Payment Form.

	 */

	function( $tax_rates, $form ) {

		switch ( $form->id ) {

			// Return a tax rate of 10% for Payment Form 13.

			case 13:

				return simpay_find_tax_rate( 10, $tax_rates );

				break;

			// Return a tax rate of 12% for Payment Form 57

			case 57:

				return simpay_find_tax_rate( 12, $tax_rates );

				break;

			// Return no rates for all other Payment Forms.

			default:

				return array();

		}

	},

	10,

	2

);