QB Issue Resolution:

Switching the name of the payment method “AMEX” to American Express caused it to reappear in the Credit card section drop down.

Resolution for Issue 'Several credit card payment types are not appearing in the Credit card dropdown when entering a payment, and are instead appearing under the additional payment types.' available: Yes (Solved).
Source: Intuit Community forum.

Several credit card payment types are not appearing in the Credit card dropdown when entering a payment, and are instead appearing under the additional payment types.: this issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the issue yourself by looking for a resolution described below. If it is a complex issue or you are unable to solve the issue, you may contact us by clicking here or by using other support options.

Support for additional payment
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