You should probably submit a reimbursement request instead. Submit an invoice if:

You cannot afford to pay first and be reimbursed later, and you are confident that the final cost of the expense will be exactly the invoice price.
You represent a business issuing an invoice to the chapter. For instance, if you are an instructor charging a fee for a class you taught.

Invoices don't have receipts, so the details are up to you. Make sure it's obvious what the expense is, how it relates to the chapter, and how the cost was determined. For instance, write "50 lbs of potatoes for community soup night" instead of "mutual aid". Insufficient information will delay the processing of your invoice.

Remember to follow the SRA's purchasing guidelines:

Chapters may not purchase firearms, ammunition, or reloading equipment.
Chapters may not purchase illegal goods or substances.
Chapters may not purchase goods made by Israeli companies.
Otherwise, chapters may purchase anything that helps the SRA fulfill its mission.

Arsom

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Training equipment