Code 1 :

/**
* Check if the submit button can be enabled and do it if so.
*
* @private
* @param {boolean} unblockUI - Whether the UI should also be unblocked.
* @return {void}
*/
_enableButton(unblockUI = true) {
console.log('\n\n---third----')
Component.env.bus.trigger('enablePaymentButton');
if (unblockUI) {
this.call('ui', 'unblock');
}
},

Code 2:

/**
* @override
*/
async start() {
// Synchronously initialize paymentContext before any await.
this.paymentContext = {};
Object.assign(this.paymentContext, this.el.dataset);

await this._super(...arguments);

// Expand the payment form of the selected payment option if there is only one.
const checkedRadio = document.querySelector('input[name="o_payment_radio"]:checked');
if (checkedRadio) {
await this._expandInlineForm(checkedRadio);
this._enableButton(false);
console.log("\n\n--first---")
} else {
this._setPaymentFlow(); // Initialize the payment flow to let providers overwrite it.
}

this.$('[data-bs-toggle="tooltip"]').tooltip();
},