Can accounts applied for on the same PC platform be merged in the international service?

Hello
Let me explain what happened first~

I have two accounts on the Path of Exile 2 international server PC platform. They are as follows:
sheng28aa#8497
sheng28aa#9188
My two accounts purchased two priority trial packages at the following times, but the purchases were all listed under the name of the account sheng28aa#8497:
sheng28aa#9188
December 8, 2024, 11:42:04 am
Thank you for helping to support Grinding Gear Games and Path of Exile!
Your order number is: 41172373
You have ordered: King of the Faridun Supporter Pack
Total cost: 100USD
sheng28aa#8497
December 8, 2024, 10:10:22 am
Thank you for helping to support Grinding Gear Games and Path of Exile!
Your order number is: 41130516
You have ordered: King of the Faridun Supporter Pack
Total cost: 100USD


I would like to ask questions as follows 1/2:
1..
Purchase two experience packs Contents 1000 Points + 1000 Points Total 2000 Points
Only appears in sheng28aa#8497 account. 2000 Points can be used to purchase items in the mall.
After logging in to the game account with the other account sheng28aa#9188, I cannot purchase items in the mall without 2000 Points.
Solution: These two accounts were created when I applied for a trial license. They are both on the same PC platform. Can he merge the same account? If so, I basically want to keep the sheng28aa#9188 account game character....
2..
Recently, I purchased the experience package with the account sheng28aa#9188. Total cost: 100USD. Credit card payment
However, the system displays an error message and cannot trade. I want to ask customer service.
2205: A valid User ID is required to complete this transaction. Please make sure you input your details correctly and try again. Otherwise, contact our customer support for further assistance at help.xsolla.com.

How to solve the problem of being unable to pay with this credit card?
Could you please answer 1/2 of the questions...Thank you