Fix Checkout & Add Automatic Multi Currency in my shopify store

I am looking for a Shopify expert who can fix the checkout process and add an automatic multi-currency feature to my store.

Checkout Process Issues:
- Unable to process payments
- Shipping options not displaying correctly
- Errors with discount codes

Multi-Currency Feature Requirements:
- No specific currency in mind, open to any currency
- Multi-currency feature is needed

Timeline:
- Flexible, no strict deadline

Ideal Skills and Experience:
- Strong knowledge and experience with Shopify
- Expertise in fixing payment processing issues
- Familiarity with configuring shipping options
- Ability to troubleshoot and resolve discount code errors
- Experience in adding and configuring multi-currency features in Shopify stores

If you have the expertise and skills required for this project, please submit your proposal.