Upgrade Shopify Store Features

As the owner of an existing Shopify store, I'm looking to enrich the functionality of my platform through implementing new features which specifically include advanced payment methods. I demand that these alterations enhance both the user experience and the operational efficiency of my store.

The ideal candidate for this job should possess:

- Exceptional proficiency in Shopify's Liquid coding language
- Proven experience in integrating various ‘buy-now-pay-later’ and international payment methods on Shopify
- Strong understanding of security measures pertinent to payment transactions
- Familiarity with the latest e-commerce trends and technologies

Responsibilities will include:

- Analysis of the current payment mechanisms and a proposal of suitable additions
- Integration of selected new payment methods in a secure and seamless manner
- Conducting tests to ensure the proper functionality of the implemented features
- Troubleshooting any issues that arise from the implementation

I look forward to closely collaborating with an individual who has previously conducted similar projects successfully, and can demonstrate a forward-thinking, innovative approach to development tasks.