The Philippians were clearly told to expect a return on their ministry investment (Phil 4:19). By apostolic-prophetic promise, a guarantee is made that the Lord will provide them with divine compensation for their sacrificial gift. This reward may not be financial, but it will be a blessing that results in true happiness, one that blooms with indifference to material prosperity. It also implies and act of faith that you could give generously out of your own poverty and still be blessed. God injects an alien happiness into our lives rather than forcing us to suck it out of our circumstances.
So the Philippians will receive credit, and be provided for because they gave. This is different than buying a status blessing. It’s not like becoming a high level patron at the local art gallery. Blessings from God cannot be bought. Instead they are a fractional reinstatement of the blessed relationship we lost in the Garden, and anticipate in the Millennial Kingdom. The first blessing is salvation, reconciliation, forgiveness, and adoption. The second blessing (let’s reclaim that term) is the joy-fruit of obedience. The ultimate blessing is heaven. Obedient generosity means life only get’s better.