1. Objective

Explain in non-technical terms WHY this PR is required.
E.g.: What feature it adds, what problem it solves...

This section will be used in the release notes.

2. Description of change

Adding functionalities that support for Omise, TrueMoney payment.

• Implementing all the necessary foundation code.
• Displaying TrueMoney payment method on both WordPress's Omise setting page and WooCommerce's checkout page.
• Handle TrueMoney payment result.

All the necessary details are listed in each commit. You may refer it from these 8 commits in this pull request.

• TrueMoney: implementing a foundation code to list the payment at the WC payment setting page.
• TrueMoney: listing TrueMoey Wallet payment method at the admin Omise Setting Page.
• TrueMoney: Be able to save the payment settings to WC configuration db.
• TrueMoney: Be able to create a new charge.
• TrueMoney: Displaying form field.
• TrueMoney: Be able to create a charge using Billing Details' phone number.
• TrueMoney: Implementing callback function.
• TrueMoney: Be able to use different phone number from Billing Details to receive OTP, at the checkout form.

3. Quality assurance

🔧 Environments:

• PHP version: 7.3.3
• WordPress: v5.2.3
• WooCommerce: v3.7.0

✏️ Details:

drafting...

4. Impact of the change

No

5. Priority of change

Normal

6. Additional Notes

This payment is available only in Thailand.
For more information, please check the official document: https://www.omise.co/truemoney