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action is not described

woocommerce_update_options_payment_gateways_(gateway_id) action-hook . WC 1.0

There is a section - this may be a gateway or custom section.

Usage

add_action( 'woocommerce_update_options_payment_gateways_(gateway_id)', 'action_function_name_3428' );
function action_function_name_3428(){
	// action...
}

Where the hook is called

WC_Settings_Payment_Gateways::save()
woocommerce_update_options_payment_gateways_(gateway_id)
woocommerce/includes/admin/settings/class-wc-settings-payment-gateways.php 227 
do_action( 'woocommerce_update_options_payment_gateways_' . $gateway->id );

Where in WP core the hook is used WooCommerce

woocommerce/includes/gateways/bacs/class-wc-gateway-bacs.php 67 
add_action( 'woocommerce_update_options_payment_gateways_' . $this->id, array( $this, 'process_admin_options' ) );
woocommerce/includes/gateways/bacs/class-wc-gateway-bacs.php 68 
add_action( 'woocommerce_update_options_payment_gateways_' . $this->id, array( $this, 'save_account_details' ) );
woocommerce/includes/gateways/cheque/class-wc-gateway-cheque.php 44 
add_action( 'woocommerce_update_options_payment_gateways_' . $this->id, array( $this, 'process_admin_options' ) );
woocommerce/includes/gateways/cod/class-wc-gateway-cod.php 44 
add_action( 'woocommerce_update_options_payment_gateways_' . $this->id, array( $this, 'process_admin_options' ) );
woocommerce/includes/gateways/paypal/class-wc-gateway-paypal.php 73 
add_action( 'woocommerce_update_options_payment_gateways_' . $this->id, array( $this, 'process_admin_options' ) );